Delete redundant tests from RP codegen tests.

These tests are clones of existing tests from the SkSL test corpus.
Since we're using the corpus directly now, this is redundant.

Change-Id: I4218b77b5ac50d0a2da69220c7ee49ce2ecdb876
Bug: skia:13676
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/626197
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
1 file changed