Implement matrixCompMult in SPIR-V backend

Bug: skia:10913
Change-Id: I59f5b0fb2d015f8543b4038c2c5b18ce24c194a8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/347956
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/src/sksl/SkSLSPIRVCodeGenerator.h b/src/sksl/SkSLSPIRVCodeGenerator.h
index 41397ad..8f3d862 100644
--- a/src/sksl/SkSLSPIRVCodeGenerator.h
+++ b/src/sksl/SkSLSPIRVCodeGenerator.h
@@ -132,6 +132,7 @@
     enum SpecialIntrinsic {
         kAtan_SpecialIntrinsic,
         kClamp_SpecialIntrinsic,
+        kMatrixCompMult_SpecialIntrinsic,
         kMax_SpecialIntrinsic,
         kMin_SpecialIntrinsic,
         kMix_SpecialIntrinsic,