LLVMCAS support on pre Windows 11
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llvm:CAS
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- LLVM
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Description
LLVMCAS currently stores large file as standalone files in the CAS directory through memory mapped file. However, it sometimes run into issues where the standalone files are not found when being looked up.
There is a known windows kernel bug that can affect it, see `hasFlushBufferKernelBug` in Path.inc but even later versions of windows 10 that contains the fix might run into the file not found issue, see CI:
https://lab.llvm.org/buildbot/#/builders/14/builds/4601
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