commit b0eb20f83acd5cff6767d5907df15396227baee6
author John Stiles <johnstiles@google.com> Fri Feb 26 15:29:33 2021 -0500
committer John Stiles <johnstiles@google.com> Fri Feb 26 22:34:05 2021 +0000
tree 828b9984eec7f653f814cb181dd901fa8412c085
parent 4add8b3624cc5dd3b2bd8ff2fe5f1ea029263ce9

Convert IRGenerator::convertPrefixExpr to PrefixExpression::Make.

Surprisingly, this actually improved our error detection slightly.
The expression `- -half4(0)` can now be simplified to `half4(0)` at
IR generation time, which allows the constant-folder to detect a
constant zero (and from there, a division by constant zero).

Change-Id: I8c4f6ab522efab5bf98913f9c6a1487b7af39a99
Bug: skia:11342, skia:11343
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/376842
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>