This is the same fix that I applied to LLVM7 here:
https://swiftshader-review.googlesource.com/c/SwiftShader/+/37608
but this time to subzero-llvm.

Fixes ANGLE dEQP tests run against SwiftShader/Subzero.

Bug: chromium:151653536
Change-Id: Ia4725b74d068a3afd99d407c53b11f757bc5e11f
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/42469
Presubmit-Ready: Antonio Maiorano <amaiorano@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>