This reverts commit a786c4a2.

Reason for revert: Breaks LLVM 3 reactor backend.

Change-Id: Ia7353182bbeab8f357bd9e4dababcc24e6cdd811
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29128Reviewed-by: Ben Clayton <bclayton@google.com>
Tested-by: Ben Clayton <bclayton@google.com>