Vulkan: Make descriptor set bindings consistent across shader stages Previously if a uniform or uniform block was used in a program's shader, a different descriptor set binding index would be used for each linked shader stage. Now, the bindings chosen for uniforms and blocks of the same name will be identical. This change also updates mActiveImagesMask in ProgramExecutable for separable programs. Bug: angleproject:4512 Tests: KHR-GLES3*.core.geometry_shader.api.max_image_uniforms ProgramPipelineTest31.MaxFragmentShaderStorageBufferObjects ProgramPipelineTest31.MaxFragmentUniformBufferObjects ProgramPipelineTest32.MaxGeometryImageUniforms GeometryShaderTestES32.MaxGeometryImageUniforms Change-Id: I3662d06b4dec284f4c51c6047e6b684b82925e3f Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3068381 Commit-Queue: Brandon Schade <b.schade@samsung.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com>