Revert of SkSL performance improvements

src/sksl/ir/SkSLFieldAccess.h

Index: src/sksl/ir/SkSLFieldAccess.h
diff --git a/src/sksl/ir/SkSLFieldAccess.h b/src/sksl/ir/SkSLFieldAccess.h
index f09c3a344709e3a4f2ceb922c2c531055c8e0d93..053498e154c85f1ea15f267a2dcc2eea0d5d76f7 100644
--- a/src/sksl/ir/SkSLFieldAccess.h
+++ b/src/sksl/ir/SkSLFieldAccess.h
@@ -18,12 +18,12 @@
  */
 struct FieldAccess : public Expression {
     FieldAccess(std::unique_ptr<Expression> base, int fieldIndex)
-    : INHERITED(base->fPosition, kFieldAccess_Kind, base->fType.fields()[fieldIndex].fType)
+    : INHERITED(base->fPosition, kFieldAccess_Kind, base->fType->fields()[fieldIndex].fType)
     , fBase(std::move(base))
     , fFieldIndex(fieldIndex) {}
 
     virtual std::string description() const override {
-        return fBase->description() + "." + fBase->fType.fields()[fFieldIndex].fName;
+        return fBase->description() + "." + fBase->fType->fields()[fFieldIndex].fName;
     }
 
     const std::unique_ptr<Expression> fBase;