broke up SkSLConstantFolding test

Bug: skia:
Change-Id: I496a6d1c82b4d3b6fdb34671de373c34abe90018
Reviewed-on: https://skia-review.googlesource.com/14321
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
1 file changed