These match changes that have been previously landed in LLVM upstream.

Bug: chromium:1223264
Change-Id: Ifb104adc7d513b38ad13d96171b290ff204a7de1
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/55128
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Peter Kasting <pkasting@google.com>
Commit-Queue: Peter Kasting <pkasting@google.com>