Fix BC1 SW decompression on platforms with RGBA PM color order

Bug: skia:9680
Change-Id: Ibe802ea574d749ebd601118d0e6da32b2a18fab2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/268619
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed