part of AsyncGetCallTrace fix for 6379830 is needed on Solaris SPARC

During stress testing of my fixes for 6432598 and 6453681, I ran into some
crashes on Solaris SPARC with both the Client and Server VMs:

Failure summary:

producer-c1-fast/Java2Demo: 1 SIGSEGV, 1 assertion failure, 133 PASSed
producer-c2-jvmg/PepTest: 1 SIGSEGV, 518 PASSed
producer-c2-prod/Java2Demo: 1 SIGSEGV, 176 PASSed


::::::::::::::
producer-c1-fast/Java2Demo/save.6432598.2/doit_loop.results
::::::::::::::
Results: 135 runs (2 FAILed, 133 PASSed)
Failure details: crashes: 2
Run duration: 1 days(s) 7 minute(s) 19 second(s)

Run #68: SIGSEGV almost 3 minutes into the run; usual run time is about
10 minutes:

  [34] __sighndlr(0xb, 0xf1dfe530, 0xf1dfe278, 0xfe2e54d8, 0x0, 0x0), at 0xff374f94
  ---- called from signal handler with signal 11 (SIGSEGV) ------
  [35] frame::interpreter_frame_method(this = ???) (optimized), at 0xfdc17264 (line ~260) in "frame.cpp"
  [36] vframeStreamCommon::fill_from_interpreter_frame(this = ???) (optimized),
at 0xfda003d8 (line ~429) in "vframe.hpp"
  [37] vframeStreamForte::forte_next(this = ???) (optimized), at 0xfdc09534 (line ~390) in "vframe.hpp"
  [38] forte_fill_call_trace_given_top(thd = ???, trace = ???, depth = ???, top_frame = CLASS) (optimized), at 0xfdc0ade0 (line ~743) in "forte.cpp"
  [39] AsyncGetCallTrace(trace = ???, depth = ???, ucontext = ???) (optimized),
at 0xfdc0b230 (line ~878) in "forte.cpp"
  [40] profhandler(sig = 29, siginfo = 0xf1dff250, ucontext = 0xf1dfef98), line
171 in "b4757672.c"
  [41] __sighndlr(0x1d, 0xf1dff250, 0xf1dfef98, 0xfd6913b8, 0x0, 0x0), at 0xff374f94
  ---- called from signal handler with signal 29 (SIGPROF) ------
  [42] _poll(0x0, 0x0, 0x3e8, 0x40cb8, 0x40c00, 0x7f97fc), at 0xff29dbe4
  [43] poll(0x0, 0xff301e00, 0x3e8, 0x0, 0x0, 0x26800), at 0xff36cb08
  [44] os_sleep(millis = ???, interruptible = ???) (optimized), at 0xfe2e29cc (line ~314) in "os_solaris.cpp"
  [45] os::sleep(thread = ???, millis = ???, interruptible = ???) (optimized), at 0xfe2e3940 (line ~2910) in "os_solaris.cpp"
  [46] JVM_Sleep(env = ???, threadClass = ???, millis = ???) (optimized), at 0xfdee9c28 (line ~2670) in "jvm.cpp"
  [47] 0xfb416390(0x109, 0xf1dff68c, 0xf1dff608, 0xffffff80, 0x50, 0x0), at 0xfb41638f


Run #83: assertion failure almost 8 minutes into the run: usual run
time is about 10 minutes:

# Internal Error (src/share/vm/code/nmethod.cpp, 1622)
#
# Error: assert(upper->pc_offset() >= pc_offset,"sanity")

  [6] report_assertion_failure(file_name = ???, line_no = ???, message = ???) (optimized), at 0xfdbba220 (line ~210) in "debug.cpp"
  [7] nmethod::find_pc_desc_internal(this = ???, pc = ???, approximate = ???) (optimized), at 0xfe2a7ab4 (line ~1622) in "nmethod.cpp"
  [8] vframeStreamForte::forte_next(this = ???) (optimized), at 0xfdc096c0 (line ~404) in "vframe.hpp"
  [9] forte_fill_call_trace_given_top(thd = ???, trace = ???, depth = ???, top_frame = CLASS) (optimized), at 0xfdc0ade0 (line ~743) in "forte.cpp"
  [10] AsyncGetCallTrace(trace = ???, depth = ???, ucontext = ???) (optimized),
at 0xfdc0b2b0 (line ~892) in "forte.cpp"
  [11] profhandler(sig = 29, siginfo = 0xf20fe4f0, ucontext = 0xf20fe238), line
171 in "b4757672.c"
  [12] __sighndlr(0x1d, 0xf20fe4f0, 0xf20fe238, 0xfd6913b8, 0x0, 0x0), at 0xff374f94
  ---- called from signal handler with signal 29 (SIGPROF) ------
  [13] 0xfb42f114(0xe, 0x7, 0xe, 0xfb42b8b0, 0xf314a380, 0x0), at 0xfb42f113


::::::::::::::
producer-c2-jvmg/PepTest/save.6432598.2/doit_loop.results
::::::::::::::
Results: 519 runs (1 FAILed, 518 PASSed)
Failure details: crashes: 1
Run duration: 1 days(s) 1 minute(s) 29 second(s)

Run #137: SIGSEGV failure almost 3 minutes into the run: usual run
time is about 3 minutes:

  [16] __sighndlr(0xb, 0xfde7e048, 0xfde7dd90, 0xfe8acb08, 0x0, 0x0), at 0xff374f94
  ---- called from signal handler with signal 11 (SIGSEGV) ------
  [17] JavaFrameAnchor::last_Java_sp(this = 0x3a), line 71 in "javaFrameAnchor_sparc.hpp"
  [18] frame::entry_frame_is_first(this = 0xfde7e3a4), line 152 in "frame.cpp"
  [19] frame::is_first_frame(this = 0xfde7e3a4), line 34 in "frame.inline.hpp"
  [20] vframeStreamCommon::fill_from_frame(this = 0xfde7e3a0), line 419 in "vframe.hpp"
  [21] vframeStreamForte::forte_next(this = 0xfde7e3a0), line 407 in "forte.cpp" [22] forte_fill_call_trace_given_top(thd = 0x4a800, trace = 0xfde7e75c, depth
= 50, top_frame = CLASS), line 743 in "forte.cpp"
  [23] AsyncGetCallTrace(trace = 0xfde7e75c, depth = 50, ucontext = 0xfde7e930), line 892 in "forte.cpp"
  [24] profhandler(sig = 29, siginfo = 0xfde7ebe8, ucontext = 0xfde7e930), line
171 in "b4757672.c"
  [25] __sighndlr(0x1d, 0xfde7ebe8, 0xfde7e930, 0xff0813b8, 0x0, 0x0), at 0xff374f94
  ---- called from signal handler with signal 29 (SIGPROF) ------
  [26] 0xfbc17000(0xf4d56518, 0xb6, 0x0, 0xfbc30860, 0xb6, 0xfde7f098), at 0xfbc16fff


::::::::::::::
producer-c2-prod/Java2Demo/save.6432598.2/doit_loop.results
::::::::::::::
Results: 176 runs (1 FAILed, 175 PASSed)
Failure details: crashes: 1
Run duration: 1 days(s) 2 minute(s) 43 second(s)

Run #85: SIGSEGV just over 4 minutes into the run: usual run
time is about 8 minutes:

  [32] __sighndlr(0xb, 0xf2afea20, 0xf2afe768, 0xfe95ab38, 0x0, 0x0), at 0xff374f94
  ---- called from signal handler with signal 11 (SIGSEGV) ------
  [33] methodOopDesc::validate_bci_from_bcx(0xfc00, 0x44, 0x23400, 0x2d738, 0xfc404fc0, 0xf2aff768), at 0xfed6a430
  [34] forte_fill_call_trace_given_top(0xf2aff768, 0xf2afeed4, 0xfef98c0c, 0xfef9f644, 0x1, 0xfef7c000), at 0xfeb45b7c
  [35] AsyncGetCallTrace(0xfeb45da8, 0x32, 0xf2aff0a8, 0x0, 0xf2afeed4, 0xfc40eb54), at 0xfeb46010
=>[36] profhandler(sig = 29, siginfo = 0xf2aff360, ucontext = 0xf2aff0a8), line
171 in "b4757672.c"
  [37] __sighndlr(0x1d, 0xf2aff360, 0xf2aff0a8, 0xfefd13b8, 0x0, 0x0), at 0xff374f94
  ---- called from signal handler with signal 29 (SIGPROF) ------
  [38] _poll(0x0, 0x0, 0x1e, 0x0, 0x0, 0x1f21c8), at 0xff29dbe4
  [39] poll(0x0, 0xff302800, 0x1e, 0x0, 0x0, 0x29cd0), at 0xff36cb08
  [40] os_sleep(0xf2aff598, 0xfefa66e0, 0x0, 0xfefb32e0, 0xfefa5de4, 0x1), at 0xfed88ea8
  [41] os::sleep(0xfeafb6f4, 0x7, 0x2a26a0, 0x1, 0x4, 0xfef7c000), at 0xfed89b18
  [42] JVM_Sleep(0xfefaa264, 0xff040000, 0x6d8c00, 0xbe930, 0x1, 0xfef7c000), at 0xfe9ba428
  [43] 0xfc40eba8(0x4a71, 0xf2aff7cc, 0xf2aff750, 0xffffff80, 0xab, 0x0), at 0xfc40eba7