Revert of SkSL performance improvements

src/sksl/ir/SkSLExpression.h

Index: src/sksl/ir/SkSLExpression.h
diff --git a/src/sksl/ir/SkSLExpression.h b/src/sksl/ir/SkSLExpression.h
index 92cb37de776bb4c3424d5b7ff8842da85bc8c223..1e42c7a4755e02cb42c9f2456d4fd9bfee44c39c 100644
--- a/src/sksl/ir/SkSLExpression.h
+++ b/src/sksl/ir/SkSLExpression.h
@@ -35,7 +35,7 @@
         kTypeReference_Kind,
     };
 
-    Expression(Position position, Kind kind, const Type& type)
+    Expression(Position position, Kind kind, std::shared_ptr<Type> type)
     : INHERITED(position)
     , fKind(kind)
     , fType(std::move(type)) {}
@@ -45,7 +45,7 @@
     }
 
     const Kind fKind;
-    const Type& fType;
+    const std::shared_ptr<Type> fType;
 
     typedef IRNode INHERITED;
 };