When separable programs are linked, varyings at the separable program's boundary need to be treated as active. Bug: angleproject:5557 Test: ProgramPipelineTest31.VaryingIOBlockSeparableProgram* Change-Id: I28af2bdf6478a408b3a7155ab4376ed6a19192f4 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2742659 Commit-Queue: Mohan Maiya <m.maiya@samsung.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com>
