service/regexp_function_test crashing on Windows

[mkustermann]

From this log:

Running "vm" command: set DART_CONFIGURATION=ReleaseX64 & out\ReleaseX64\dart.exe --ignore-unrecognized-flags --packages=C:\b\s\w\ir\.packages C:\b\s\w\ir\samples\sample_extension\test\sample_extension_script_snapshot_test.dart
FAILED: dartk-vm release_x64 service/regexp_function_test
Expected: Pass
Actual: Crash
--- Command "vm" (took 01.000374s):
set DART_CONFIGURATION=ReleaseX64 & out\ReleaseX64\dart.exe --interpret_irregexp --ignore-unrecognized-flags --packages=C:\b\s\w\ir\.packages C:\b\s\w\ir\runtime\observatory\tests\service\regexp_function_test.dart
exit code:
-1073741819
--- Re-run this test:
python tools/test.py -m release -n dartk-win-release-x64 --output-directory C:\b\s\w\ioyov0rg service/regexp_function_test

This seems to crash consistently.

/cc @rmacnak-google

[bkonyi]

Fixed in this CL.