Support color write mask in pipeline
Support color write mask in pipeline

Bug: b/118386749
Test: dEQP-VK.pipeline.*
Change-Id: Ie549802e6ea9ad89760e2439de5776121fae8c58
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29028
Tested-by: Chris Forbes <c3279c50043e18e9442c1ae071cafa0e7a4ca967@google.com>
Reviewed-by: Nicolas Capens <51edc787c30f24c4904e8ffbb5523c3a9f7a451d@google.com>
Reviewed-by: Alexis Hétu <1c7141772178a7e80858c3db5052b328076f08f4@google.com>

bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,google/swiftshader