opto/node.hpp:355, assert(i < _max) failed: oob: i=1, _max=1

Nightly failure on Windows 32, two tests with similar-looking stacks at failure:

com/sun/jdi/AcceptTimeout.java
nsk/jdi/EventRequestManager/hashCode/hashcode001

VM options:
  -server -Xmixed -XX:MaxRAMFraction=8 -XX:+CreateMinidumpOnCrash -ea -esa -XX:-TieredCompilation -XX:CompileThreshold=100 -XX:+UnlockExperimentalVMOptions

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (C:\...\hotspot\src\share\vm\opto/node.hpp:355), pid=5200, tid=4352
# assert(i < _max) failed: oob: i=1, _max=1

V [jvm.dll+0x2e1ae5] VMError::report_and_die+0x3d5;; ?report_and_die@VMError@@QAEXXZ+0x3d5
V [jvm.dll+0x2d5735] report_vm_error+0x45;; ?report_vm_error@@YAXPBDH00@Z+0x45
V [jvm.dll+0x4d97d8] Node::in+0x38;; ?in@Node@@QBEPAV1@I@Z+0x38
V [jvm.dll+0x5e845e] PhaseIterGVN::add_users_to_worklist+0x4ce;; ?add_users_to_worklist@PhaseIterGVN@@QAEXPAVNode@@@Z+0x4ce
V [jvm.dll+0x5eabf0] PhaseIterGVN::transform_old+0x360;; ?transform_old@PhaseIterGVN@@EAEPAVNode@@PAV2@@Z+0x360
V [jvm.dll+0x5ea7b7] PhaseIterGVN::optimize+0x147;; ?optimize@PhaseIterGVN@@QAEXXZ+0x147
V [jvm.dll+0x57b6a6] PhaseIdealLoop::build_and_optimize+0xb76;; ?build_and_optimize@PhaseIdealLoop@@AAEX_N0@Z+0xb76
V [jvm.dll+0x50b963] PhaseIdealLoop::PhaseIdealLoop+0xa3;; ??0PhaseIdealLoop@@QAE@AAVPhaseIterGVN@@_N1@Z+0xa3
V [jvm.dll+0x515ae8] Compile::Optimize+0x6f8;; ?Optimize@Compile@@AAEXXZ+0x6f8
V [jvm.dll+0x51698a] Compile::Compile+0xcba;; ??0Compile@@QAE@PAVciEnv@@PAVC2Compiler@@PAVciMethod@@H_N33@Z+0xcba
V [jvm.dll+0x4e8018] C2Compiler::compile_method+0xd8;; ?compile_method@C2Compiler@@UAEXPAVciEnv@@PAVciMethod@@H@Z+0xd8
V [jvm.dll+0xd0187] CompileBroker::invoke_compiler_on_method+0x417;; ?invoke_compiler_on_method@CompileBroker@@CAXPAVCompileTask@@@Z+0x417
V [jvm.dll+0xd0973] CompileBroker::compiler_thread_loop+0x2b3;; ?compiler_thread_loop@CompileBroker@@SAXXZ+0x2b3
V [jvm.dll+0x2a0999] JavaThread::thread_main_inner+0xd9;; ?thread_main_inner@JavaThread@@QAEXXZ+0xd9
V [jvm.dll+0x2a0b33] JavaThread::run+0x173;; ?run@JavaThread@@UAEXXZ+0x173
V [jvm.dll+0x30560c] java_start+0xcc;; ?java_start@@YGIPAVThread@@@Z+0xcc

and (different compilation events)

Compilation events (10 events):
Event: 0.990 Thread 0x28af7400 nmethod 168 0x02981208 code [0x02981320, 0x02981590]
Event: 0.990 Thread 0x28af7400 169 java.lang.String::toLowerCase (8 bytes)
Event: 0.991 Thread 0x28af7400 nmethod 169 0x02980f88 code [0x02981080, 0x029810dc]
Event: 0.991 Thread 0x28af7400 170 java.util.Locale::getDefault (4 bytes)
Event: 0.991 Thread 0x28af7400 nmethod 170 0x0298a688 code [0x0298a780, 0x0298a7d0]
Event: 0.991 Thread 0x28af7400 171 java.net.URL::getPort (5 bytes)
Event: 0.991 Thread 0x28af7400 nmethod 171 0x0298a488 code [0x0298a580, 0x0298a5d0]
Event: 0.991 Thread 0x28af7400 173 sun.nio.cs.FastCharsetProvider::toLower (122 bytes)
Event: 1.009 Thread 0x28af7400 nmethod 173 0x02989208 code [0x02989320, 0x02989970]
Event: 1.009 Thread 0x28af7400 174 % sun.nio.cs.UTF_8$Decoder::decodeArrayLoop @ 73 (691 bytes)

and

Compilation events (10 events):
Event: 1.299 Thread 0x278b8400 nmethod 174 0x02dd5988 code [0x02dd5ae0, 0x02dd6190]
Event: 1.299 Thread 0x278b8400 181 java.io.WinNTFileSystem::parentOrNull (171 bytes)
Event: 1.312 Thread 0x278b8400 nmethod 181 0x02de1a08 code [0x02de1b20, 0x02de1f1c]
Event: 1.312 Thread 0x278b8400 182 java.io.File::exists (43 bytes)
Event: 1.321 Thread 0x278b8400 nmethod 182 0x02dd0388 code [0x02dd04a0, 0x02dd065c]
Event: 1.321 Thread 0x278b8400 183 java.util.LinkedHashMap::get (33 bytes)
Event: 1.332 Thread 0x278b8400 nmethod 183 0x02dd1808 code [0x02dd1940, 0x02dd1ce4]
Event: 1.332 Thread 0x278b8400 184 sun.util.calendar.CalendarDate::isNormalized (5 bytes)
Event: 1.332 Thread 0x278b8400 nmethod 184 0x02dd0188 code [0x02dd0280, 0x02dd02d0]
Event: 1.332 Thread 0x278b8400 185 % sun.nio.cs.UTF_8$Decoder::decodeArrayLoop @ 73 (691 bytes)