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Revert rL349624 : Let TableGen write output only if it changed, instead of…

Authored by RKSimon on Oct 1 2019, 6:39 AM.

Description

Revert rL349624 : Let TableGen write output only if it changed, instead of doing so in cmake, attempt 2

Differential Revision: https://reviews.llvm.org/D55842

As discussed on PR43385 this is causing Visual Studio msbuilds to perpetually rebuild all tablegen generated files

llvm-svn: 373338