[Profiler] Save and restore the value of errno in the signal handler#3370
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Summary of changes
Save and restore the value of errno in the signal handler.
Reason for change
It seems like the Libunwind can change the value of errno when validating whether an address is valid: https://github.com/libunwind/libunwind/blob/47aef9392723e4816d94d4efda4248180aece7f5/src/x86_64/Ginit.c#L185
This can lead the CLR to preventively crash because it finds an unexpected errono value after calling epoll_wait.