Prevents Vulkan validation error by replacing the input format for any
mismatched vertex attributes with a format compatible to what the shader
expects.

Bug: angleproject:3436
Change-Id: Ia52f29c084d82bbc4e9149102cd4b5fc25ccb9b3
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1698567
Commit-Queue: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>