This reverts commit 0179e5eb.

Reason for revert: Breaks LLVM 3 reactor backend.

Change-Id: I0cdeac496c25b8b8994339e0b4b5a002d2e597f5
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29129Reviewed-by: Ben Clayton <bclayton@google.com>
Tested-by: Ben Clayton <bclayton@google.com>