This has been removed in LLVM master.

Bug: b/152339534
Change-Id: I613bae6c31944457bd52278228e33af6f85cce97
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/43810
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>