Interpreter: Implement/fix vectorized load/store of globals

Also has swizzled loads of globals. Swizzle stores are still broken.

Change-Id: I0c01a309592c0aa460e1459de2636a2e1ef2ee6c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/213830
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
4 files changed