SkVx.h attempted to not use vector instructions if SKNX_NO_SIMD was set.
However, this was incomplete and could lead to a wasm build with
SKNX_NO_SIMD still trying to use some vector instructions which are
not present if __wasm_simd128__ is defined.
This change requires some additional "include what you use" includes
since some other files were depending on SkVx.h including the vector
instruction headers.
Bug: cl/421848579
Change-Id: I6a878d64b76677a925b94724926c62f3e42ddd4c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/496313
Reviewed-by: Herb Derby <herb@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
b042508dd5