unittest: Disable MachineInstrClone.CopyCallSiteInfo on Windows
A bot error (http://45.33.8.238/win/12463/step_11.txt) reports 'unknown
file: error: SEH exception with code 0x3221225477 thrown in the test
body', but I don't know what causes this.
It looks like this has come up before, but afaict the root causes could
be different:
https://reviews.llvm.org/rL329195, and in
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-
20180910/587425.html
I tried testing locally with UBSan, but that didn't uncover anything.
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