Update test sksl_large to be ES2 compatible.
Update test sksl_large to be ES2 compatible.

SkVM does not support nonconstant array indexing because this is an ES3
feature, but sksl_large was using the ES3-specific looping binary
colorizer for gradients. This prevented SkVM from compiling the
benchmark. sksl_large has been regenerated with
`nonconstantArrayIndexSupport` set to false in the GrShaderCaps.

Change-Id: If706d9544d1bc0d9c49c59c925a517f677262c85
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/533956
Auto-Submit: John Stiles <f4fcf42d3bb5924557f1eeb3be66747535e585da@google.com>
Reviewed-by: Brian Osman <794c0b5534edf5601d88e1d41975d0262da12894@google.com>
Commit-Queue: John Stiles <f4fcf42d3bb5924557f1eeb3be66747535e585da@google.com>

google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia