Implement shader invocation control functions and shader memory
control functions on D3D backend.

BUG=angleproject:2280
TEST=angle_end2end_tests.ComputeShaderTest.ShaderInvocationAndMemoryControl

Change-Id: I836c3abde35f19dd40a68cf82ae7c5417c551ab4
Reviewed-on: https://chromium-review.googlesource.com/911986
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>