GL: Remove in-thread link status check from parallel link path. 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/+/2647987 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>