get skvm/llvm building again

i8x4/I8x4 are unused since removing Op::bytes,
and since LLVM 10 we need to include IntrinsicsX86.h.

Change-Id: Ib4b60a31bb55b0f22a74c4c6b6ae5e50d075235f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/282185
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed