Revert of SkSL performance improvements

src/sksl/ir/SkSLVariable.h

Index: src/sksl/ir/SkSLVariable.h
diff --git a/src/sksl/ir/SkSLVariable.h b/src/sksl/ir/SkSLVariable.h
index 39af3093b6ab20ce53e35501b00906c88075344e..d4ea2c4a43e78ce8c2ba829dace13b8accd3f1c4 100644
--- a/src/sksl/ir/SkSLVariable.h
+++ b/src/sksl/ir/SkSLVariable.h
@@ -27,7 +27,7 @@
         kParameter_Storage
     };
 
-    Variable(Position position, Modifiers modifiers, std::string name, const Type& type,
+    Variable(Position position, Modifiers modifiers, std::string name, std::shared_ptr<Type> type,
              Storage storage)
     : INHERITED(position, kVariable_Kind, std::move(name))
     , fModifiers(modifiers)
@@ -37,11 +37,12 @@
     , fIsWrittenTo(false) {}
 
     virtual std::string description() const override {
-        return fModifiers.description() + fType.fName + " " + fName;
+        return fModifiers.description() + fType->fName + " " + fName;
     }
 
     const Modifiers fModifiers;
-    const Type& fType;
+    const std::string fValue;
+    const std::shared_ptr<Type> fType;
     const Storage fStorage;
 
     mutable bool fIsReadFrom;
@@ -52,4 +53,14 @@
 
 } // namespace SkSL
 
+namespace std {
+    template <>
+        struct hash<SkSL::Variable> {
+        public :
+        size_t operator()(const SkSL::Variable &var) const{
+            return hash<std::string>()(var.fName) ^ hash<std::string>()(var.fType->description());
+        }
+    };
+} // namespace std
+
 #endif