A call to checkLinkStatus was wrongly placed in the
nativeParallelCompile path, which ended up blocking on shader linking,
rendering parallel compilation useless.

Bug: chromium:1169477
Bug: chromium:1099763
Change-Id: Id2c5fe31e651abac76207c93919fd83d79f30556
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2647987Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>