Revert of SkSL performance improvements (patchset #6 id:140001 of https://codereview.chromium.org/2131223002/ )

Reason for revert:
Valgrind bot failures

https://build.chromium.org/p/client.skia/builders/Test-Ubuntu-GCC-ShuttleA-GPU-GTX550Ti-x86_64-Release-Valgrind/builds/1224/steps/test_skia%20on%20Ubuntu/logs/stdio

Original issue's description:
> SkSL performance improvements (plus a couple of minor warning fixes)
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2131223002
>
> Committed: https://skia.googlesource.com/skia/+/9fd67a1f53809f5eff1210dd107241b450c48acc

TBR=benjaminwagner@google.com,egdaniel@google.com,ethannicholas@google.com
# Not skipping CQ checks because original CL landed more than 1 days ago.

Review-Url: https://codereview.chromium.org/2143323003

1 files changed, 5 insertions, 5 deletions

diff --git a/src/sksl/ir/SkSLVariableReference.h b/src/sksl/ir/SkSLVariableReference.h
index b443da1f22..8499511a1b 100644
--- a/src/sksl/ir/SkSLVariableReference.h
+++ b/src/sksl/ir/SkSLVariableReference.h
@@ -20,15 +20,15 @@ namespace SkSL {
  * there is only one Variable 'x', but two VariableReferences to it.
  */
 struct VariableReference : public Expression {
-    VariableReference(Position position, const Variable& variable)
-    : INHERITED(position, kVariableReference_Kind, variable.fType)
-    , fVariable(variable) {}
+    VariableReference(Position position, std::shared_ptr<Variable> variable)
+    : INHERITED(position, kVariableReference_Kind, variable->fType)
+    , fVariable(std::move(variable)) {}
 
     std::string description() const override {
-        return fVariable.fName;
+        return fVariable->fName;
     }
 
-    const Variable& fVariable;
+    const std::shared_ptr<Variable> fVariable;
 
     typedef Expression INHERITED;
 };