Fixes to alignment issues with regards to mapped vulkan memory.

Bug: skia:
Change-Id: Ida9813fe774580a6d157b8eb8d330488c8e8c4bc
Reviewed-on: https://skia-review.googlesource.com/109483
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
9 files changed