Revert of SkSL performance improvements

src/sksl/ir/SkSLFunctionReference.h

Index: src/sksl/ir/SkSLFunctionReference.h
diff --git a/src/sksl/ir/SkSLFunctionReference.h b/src/sksl/ir/SkSLFunctionReference.h
index 8afcbb1e32326c6b41fb6d344e183af60735cd9a..d5cc444000c9324b694517b794f33c4839f234fb 100644
--- a/src/sksl/ir/SkSLFunctionReference.h
+++ b/src/sksl/ir/SkSLFunctionReference.h
@@ -17,8 +17,8 @@
  * always eventually replaced by FunctionCalls in valid programs.
  */
 struct FunctionReference : public Expression {
-    FunctionReference(Position position, std::vector<const FunctionDeclaration*> function)
-    : INHERITED(position, kFunctionReference_Kind, *kInvalid_Type)
+    FunctionReference(Position position, std::vector<std::shared_ptr<FunctionDeclaration>> function)
+    : INHERITED(position, kFunctionReference_Kind, kInvalid_Type)
     , fFunctions(function) {}
 
     virtual std::string description() const override {
@@ -26,7 +26,7 @@
     	return "<function>";
     }
 
-    const std::vector<const FunctionDeclaration*> fFunctions;
+    const std::vector<std::shared_ptr<FunctionDeclaration>> fFunctions;
 
     typedef Expression INHERITED;
 };