Crash during Dart SDK build on Windows/simarm64

[alexmarkov]

vm-kernel-msvc-windows bot started failing since https://github.com/dart-lang/sdk/compare/98055e5b86ba16e765c1ee0a5d7fd558eeb9f199~...4198020cce8e9a1055ee575c38cd9bf89f032ee3

[2969/3145] ACTION //runtime/bin:generate_snapshot_bin(//build/toolchain/win:arm64)
FAILED: gen/runtime/bin/vm_snapshot_data.bin gen/runtime/bin/vm_snapshot_instructions.bin gen/runtime/bin/isolate_snapshot_data.bin gen/runtime/bin/isolate_snapshot_instructions.bin 
C:/b/s/w/ir/cipd_bin_packages/cpython3/bin/python3.exe ../../build/gn_run_binary.py compiled_action x64/gen_snapshot.exe --sound-null-safety --deterministic --snapshot_kind=core --vm_snapshot_data=gen/runtime/bin/vm_snapshot_data.bin --vm_snapshot_instructions=gen/runtime/bin/vm_snapshot_instructions.bin --isolate_snapshot_data=gen/runtime/bin/isolate_snapshot_data.bin --isolate_snapshot_instructions=gen/runtime/bin/isolate_snapshot_instructions.bin C:/b/s/w/ir/cache/builder/sdk/out/DebugXARM64/vm_platform_strong_stripped.dill
Command failed: C:\b\s\w\ir\cache\builder\sdk\out\DebugXARM64\x64\gen_snapshot.exe --sound-null-safety --deterministic --snapshot_kind=core --vm_snapshot_data=gen/runtime/bin/vm_snapshot_data.bin --vm_snapshot_instructions=gen/runtime/bin/vm_snapshot_instructions.bin --isolate_snapshot_data=gen/runtime/bin/isolate_snapshot_data.bin --isolate_snapshot_instructions=gen/runtime/bin/isolate_snapshot_instructions.bin C:/b/s/w/ir/cache/builder/sdk/out/DebugXARM64/vm_platform_strong_stripped.dill
output: 
===== CRASH =====
ExceptionCode=-1073741819, ExceptionFlags=0, ExceptionAddress=00007FF693EC5EB7
version=2.19.0-edge.4198020cce8e9a1055ee575c38cd9bf89f032ee3 (be) (Tue Sep 13 23:50:01 2022 +0000) on "windows_simarm64"
pid=6428, thread=5772, isolate_group=isolate(00000200535C3030), isolate=isolate(00000200535CC810)
os=windows, arch=arm64, comp=no, sim=yes
isolate_instructions=0, vm_instructions=0
  pc 0x00007ff693ec5eb7 fp 0x00000005fd8f9b80 common_strnlen_c<0,unsigned char>+0x57
-- End of DumpStackTrace

ninja: build stopped: subcommand failed.
BUILD FAILED

/cc @rmacnak-google @a-siva

[alexmarkov]

Bisected to 2ead86ab9dcbfe9217af01670c7d93ede73381c9. /cc @brianquinlan