Vulkan wrapper functions are fairly straightforward.  They call the
Vulkan function and return immediately.  The specialized macros
introduced in this commit take care of the final return for brevity of
the warpper.

Additionally, this commit gets rid of ANGLE_EMPTY_STATEMENT in favor of
the more robust macro definition using do {} while (0).

Bug: none
Change-Id: Ia7c68962d1aeee2c06ef210122b345b1a2e54f08
Reviewed-on: https://chromium-review.googlesource.com/c/1262020
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>