Revert of SkSL performance improvements

src/sksl/ir/SkSLSwizzle.h

Index: src/sksl/ir/SkSLSwizzle.h
diff --git a/src/sksl/ir/SkSLSwizzle.h b/src/sksl/ir/SkSLSwizzle.h
index fad71b8114cc92480b49e9fa9d869c5106ddaa00..ce360d18471c88546990d8042fc731d37fd36bcb 100644
--- a/src/sksl/ir/SkSLSwizzle.h
+++ b/src/sksl/ir/SkSLSwizzle.h
@@ -18,40 +18,41 @@
  * instance, swizzling a vec3 with two components will result in a vec2. It is possible to swizzle
  * with more components than the source vector, as in 'vec2(1).xxxx'.
  */
-static const Type& get_type(Expression& value, size_t count) {
-    const Type& base = value.fType.componentType();
+static std::shared_ptr<Type> get_type(Expression& value, 
+                                      size_t count) {
+    std::shared_ptr<Type> base = value.fType->componentType();
     if (count == 1) {
         return base;
     }
-    if (base == *kFloat_Type) {
+    if (base == kFloat_Type) {
         switch (count) {
-            case 2: return *kVec2_Type;
-            case 3: return *kVec3_Type;
-            case 4: return *kVec4_Type;
+            case 2: return kVec2_Type;
+            case 3: return kVec3_Type;
+            case 4: return kVec4_Type;
         }
-    } else if (base == *kDouble_Type) {
+    } else if (base == kDouble_Type) {
         switch (count) {
-            case 2: return *kDVec2_Type;
-            case 3: return *kDVec3_Type;
-            case 4: return *kDVec4_Type;
+            case 2: return kDVec2_Type;
+            case 3: return kDVec3_Type;
+            case 4: return kDVec4_Type;
         }
-    } else if (base == *kInt_Type) {
+    } else if (base == kInt_Type) {
         switch (count) {
-            case 2: return *kIVec2_Type;
-            case 3: return *kIVec3_Type;
-            case 4: return *kIVec4_Type;
+            case 2: return kIVec2_Type;
+            case 3: return kIVec3_Type;
+            case 4: return kIVec4_Type;
         }
-    } else if (base == *kUInt_Type) {
+    } else if (base == kUInt_Type) {
         switch (count) {
-            case 2: return *kUVec2_Type;
-            case 3: return *kUVec3_Type;
-            case 4: return *kUVec4_Type;
+            case 2: return kUVec2_Type;
+            case 3: return kUVec3_Type;
+            case 4: return kUVec4_Type;
         }
-    } else if (base == *kBool_Type) {
+    } else if (base == kBool_Type) {
         switch (count) {
-            case 2: return *kBVec2_Type;
-            case 3: return *kBVec3_Type;
-            case 4: return *kBVec4_Type;
+            case 2: return kBVec2_Type;
+            case 3: return kBVec3_Type;
+            case 4: return kBVec4_Type;
         }
     }
     ABORT("cannot swizzle %s\n", value.description().c_str());