In a few places we initialize resource on the stack in the Vulkan
back-end. When we do this we should use a RAII wrapper so that if we
generate an error and unwind the stack we can auto-release the object.

This fixes a bug that was being triggered by an unexpected failure on
Present with the Vulkan back-end on Intel.

There are several other places in the code that should be modified to
use the new wrapper.

Bug: angleproject:2690
Change-Id: I49a1c5516756f8b7dba833aca65926aa7b8bd5c6
Reviewed-on: https://chromium-review.googlesource.com/1118610
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>