In Renderer11::compileToExecutable and HLSLCompiler::compileToBinary.
Because they are called from a worker thread, there are problems with
D3D debug annotator being accessed from multiple threads.
Previous fix to guard annotator accesses by a mutex reduced flakiness,
but not completely, maybe due to a D3D erroneously thinking there is
multithreaded access while there is none.

Bug: angleproject:3780
Change-Id: I8beea76b6d21f3378462992bbfab916c9db6b1ef
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1742642
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>