Added dead variable / code elimination to skslc.

BUG=skia:

Change-Id: Ib037730803a8f222f099de0e001fe06ad452a22c
Reviewed-on: https://skia-review.googlesource.com/7584
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Ben Wagner <benjaminwagner@google.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/sksl/ir/SkSLPostfixExpression.h b/src/sksl/ir/SkSLPostfixExpression.h
index 6c9fafe5a0..1c400f9fee 100644
--- a/src/sksl/ir/SkSLPostfixExpression.h
+++ b/src/sksl/ir/SkSLPostfixExpression.h
@@ -21,7 +21,11 @@ struct PostfixExpression : public Expression {
     , fOperand(std::move(operand))
     , fOperator(op) {}
 
-    virtual SkString description() const override {
+    bool hasSideEffects() const override {
+        return true;
+    }
+
+    SkString description() const override {
         return fOperand->description() + Token::OperatorName(fOperator);
     }