Vulkan: Fix alignment issue with context staging buffer Context's staging buffer is shared for all kind of usages. We should pass in alignment requirement for allocate call whenever it is different from the default alignment. This adds allocateWithAlignment call to DynamicBuffer call and switch ImgeHelper's usage of it to allocateWithAlignment Bug: b/164511310 Change-Id: Idcb6b6f95d6862ee6cb8fca9c164910b7e085a17 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2373590 Commit-Queue: Charlie Lao <cclao@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com>