Nico Weber 204623e05c Reland r349624: Let TableGen write output only if it changed, instead of doing so in cmake ...

Move the write-if-changed logic behind a flag and don't pass it
with the MSVC generator. msbuild doesn't have a restat optimization,
so not doing write-if-change there doesn't have a cost, and it
should fix whatever causes PR43385.

llvm-svn: 373664

2019-10-03 21:22:28 +00:00

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