Java stack trace on error broken for interpreter frames.

Here's an example:

Current thread (0x00048800): JavaThread "main" [_thread_in_vm, id=2, stack(0xfccf0000,0xfcd08000)]

Stack: [0xfccf0000,0xfcd08000], sp=0xfcd07308, free space=92k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x127f234]
V [libjvm.so+0x6742c4]
V [libjvm.so+0x707270]
V [libjvm.so+0x81d14c]
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::Interpreter
v ~BufferBlob::StubRoutines (1)
V [libjvm.so+0x8408ac]
V [libjvm.so+0x88c134]
V [libjvm.so+0x8e73dc]
C [java+0x1f30]

~BufferBlob::Interpreter should decode as a Java stack frame.