These test failures were fixed with a recent SwS CL:
https://swiftshader-review.googlesource.com/c/SwiftShader/+/52088

Bug: angleproject:5044
Test: dEQP-GLES3.functional.fbo.invalidate.whole.unbind_blit_msaa_color
Test: dEQP-GLES3.functional.fbo.invalidate.whole.unbind_blit_msaa_stencil
Change-Id: I36034c72e28fc07ecff0eaca31745c97f054b77e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2654526
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>