For "vec3(vec3<T>) -> vec3<T>", this CL makes T also include abstract
int and float (all scalars).
Bug: tint:1731
Change-Id: I776c7ba6872c3d680982dbec6b0970389e720611
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/107540
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Antonio Maiorano <amaiorano@google.com>