[llvm] [TableGen] Use a more efficient memory buffer for output (PR #123353)

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

I think we should use timestamp based approach rather than file comparison (see gcc's -MD/-MT/-MF/...).
Not sure how difficult it would be to integrate it with cmake/bazel.


https://github.com/llvm/llvm-project/pull/123353