clang was crashing e.g. in  issue 771673 

As a secondary effect of the crash, we get output like
Wrote crash dump file "C:\b\rr\tmpb9_ujj\t\clang-cl.exe-fd54a2.dmp"
LLVMSymbolizer: error reading file: DIA Error: An unknown error has occurred.  HRESULT: 0x8007007E: Calling NoRegCoCreate
LLVMSymbolizer: error reading file: DIA Error: An unknown error has occurred.  HRESULT: 0x8007007E: Calling NoRegCoCreate
LLVMSymbolizer: error reading file: DIA Error: An unknown error has occurred.  HRESULT: 0x8007007E: Calling NoRegCoCreate



...which is a bit weird, and also potentially confusing. Nothing urgent, but I figured I'd file a bug for it.