ARM32 unwinding issue

[MichalStrehovsky]

Linux Pri1 arm32 outerloop legs have been failing with a mysterious AzureDevOpsServiceError: The added or subtracted value results in an un-representable DateTime. failure for a couple weeks now. I thought it's an infra issue and filed dotnet/dnceng#6034 on it (the tests are all passing but something wrong happens during results upload).

Since there has been no progress on that, I decided to investigate on my own.

Sleuthing in the logs and infra source code, I eventually found out the problem is likely in the testresults.xml that we generate:

<test name="JIT/Regression/CLR-x86-JIT/V1-M12-Beta2/b51420/b51420/b51420.dll" type="ILGEN_0xbc077bd" method="Main" time="922337203685.427490" result="Pass"></test>

Notice very weird time= value.

On a hunch I tried revert of #117588 in #118919. It had a successful arm32 run. Looks like there is more to this fix.

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[jkotas]

Hmm, interesting. The Arm32 specific change was very small. I am experimenting with this further in #118944