Revert of SkSL performance improvements

src/sksl/ir/SkSLUnresolvedFunction.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
  
 #ifndef SKSL_UNRESOLVEDFUNCTION
 #define SKSL_UNRESOLVEDFUNCTION
 
 #include "SkSLFunctionDeclaration.h"
 
 namespace SkSL {
 
 /**
  * A symbol representing multiple functions with the same name.
  */
 struct UnresolvedFunction : public Symbol {
-    UnresolvedFunction(std::vector<const FunctionDeclaration*> funcs)
+    UnresolvedFunction(std::vector<std::shared_ptr<FunctionDeclaration>> funcs)
     : INHERITED(Position(), kUnresolvedFunction_Kind, funcs[0]->fName)
     , fFunctions(std::move(funcs)) {
-#ifdef DEBUG
         for (auto func : funcs) {
                 ASSERT(func->fName == fName);
         }
-#endif
     }
 
     virtual std::string description() const override {
         return fName;
     }
 
-    const std::vector<const FunctionDeclaration*> fFunctions;
+    const std::vector<std::shared_ptr<FunctionDeclaration>> fFunctions;
 
     typedef Symbol INHERITED;
 };
 
 } // namespace
 
 #endif