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 d5cc444000c9324b694517b794f33c4839f234fb..bd30506fa9ccf4a8236251c635efd09b2382e554 100644
--- a/src/sksl/ir/SkSLFunctionReference.h
+++ b/src/sksl/ir/SkSLFunctionReference.h
@@ -17,7 +17,7 @@ namespace SkSL {
  * always eventually replaced by FunctionCalls in valid programs.
  */
 struct FunctionReference : public Expression {
-    FunctionReference(Position position, std::vector<std::shared_ptr<FunctionDeclaration>> function)
+    FunctionReference(Position position, std::vector<const FunctionDeclaration*> function)
     : INHERITED(position, kFunctionReference_Kind, kInvalid_Type)
     , fFunctions(function) {}
 
@@ -26,7 +26,7 @@ struct FunctionReference : public Expression {
     	return "<function>";
     }
 
-    const std::vector<std::shared_ptr<FunctionDeclaration>> fFunctions;
+    const std::vector<const FunctionDeclaration*> fFunctions;
 
     typedef Expression INHERITED;
 };