Cleans up some noise that appears in dumps of pretty much every GLSL
shader.

Change-Id: I602a6356110803e30fcd8ba9818e56efa70bf5d6
Reviewed-on: https://swiftshader-review.googlesource.com/20769Tested-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>