I recently discovered a very long-standing bug in the GLSL reference
compiler (circa 2002) that has managed to propagate to Mesa, glslang,
SwiftShader, and several GPU drivers. I'm trying to patch it where I
can.

A description of the issue is here:
https://github.com/KhronosGroup/glslang/issues/2645

Change-Id: I5c4985bcb05eadfc6559cf08929d9ef77c24096d
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/54428Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Tested-by: John Stiles <johnstiles@google.com>