llvm

6e571108 - [DEBUG][CI] Install WinDbg if absent, disable gtest SEH catch, .ecxr

[DEBUG][CI] Install WinDbg if absent, disable gtest SEH catch, .ecxr cdb missing on icx runner; install via winget. Set GTEST_CATCH_EXCEPTIONS=0 so the access violation reaches the debugger (gtest's __except otherwise swallows it -> empty stack, clean exit, no WER dump). Add .ecxr to switch to the exception context before printing the stack. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>