[drlvm][thread][reliability] assert in JIT while unwinding stack (during enumeration)

2 reliablity tests failed on assertion in jit:
1. CharsetSyncCacheTest
2. ZlibTest

svn rev 548320

Call stack:
jitrino.dll!_assert(const char * expr=0x01ba9f08, const char * filename=0x01ba9eb0, unsigned int lineno=0x000000ac) Line 295 C
> jitrino.dll!Jitrino::Ia32::StackInfo::read(Jitrino::MethodDesc * pMethodDesc=0x03bef720, unsigned int eip=0x00000000, bool isFirst=false) Line 172 + 0x1a C++
jitrino.dll!Jitrino::Ia32::RuntimeInterface::unwindStack(Jitrino::MethodDesc * methodDesc=0x03bef720, JitFrameContext * context=0x02de90d4, bool isFirst=false) Line 40 C++
jitrino.dll!Jitrino::Jitrino::UnwindStack(Jitrino::MethodDesc * methodDesc=0x03bef720, JitFrameContext * context=0x02de90d4, bool isFirst=false) Line 280 + 0x1e C++
jitrino.dll!JIT_unwind_stack_frame(void * jit=0x012a6a48, Method * method=0x02cb3668, JitFrameContext * context=0x02de90d4) Line 362 + 0x18 C++
harmonyvm.dll!Dll_JIT::unwind_stack_frame(Method * method=0x02cb3668, JitFrameContext * context=0x02de90d4) Line 94 + 0x14 C++
harmonyvm.dll!si_goto_previous(StackIterator * si=0x02de90d0, bool over_popped=false) Line 315 + 0x32 C++
harmonyvm.dll!vm_enumerate_root_set_single_thread_on_stack(StackIterator * si=0x02de90d0) Line 339 + 0xb C++
harmonyvm.dll!vm_enumerate_thread(VM_thread * thread=0x02d7e088) Line 224 + 0x9 C++
harmonyvm.dll!stop_the_world_root_set_enumeration() Line 110 + 0xc C++
harmonyvm.dll!vm_enumerate_root_set_all_threads() Line 150 C++
gc_gen.dll!gc_reclaim_heap(GC * gc=0x014d5de8, unsigned int gc_cause=0x00000003) Line 295 + 0x8 C++
gc_gen.dll!gc_force_gc() Line 138 + 0xd C++
harmonyvm.dll!Java_java_lang_VMMemoryManager_runGC(JNIEnv_External * __formal=0x02d9e240, JNIEnv_External * __formal=0x02d9e240) Line 138 + 0x8 C++
03bf33ef()
harmonyvm.dll!get_vm_thread(HyThread * thr=0x03bef9ec) Line 193 + 0xb C++
harmonyvm.dll!get_vm_thread(HyThread * thr=0x00000001) Line 194 + 0x7 C++

To reproduce onee needs to run these tests with 30 min cycle (set <property name="test.duration" value="1800" /> parameter in build.xml of reliablity tests).