Sema: address post-commit review comment

Hoist the IgnoreParens so that we ignore it around attributes as well in order
to future-proof the code.  Addresses Richard's comments for SVN r219974.

llvm-svn: 220053
diff --git a/clang/lib/Sema/SemaStmt.cpp b/clang/lib/Sema/SemaStmt.cpp
index 8a28b29..0c2d9e3 100644
--- a/clang/lib/Sema/SemaStmt.cpp
+++ b/clang/lib/Sema/SemaStmt.cpp
@@ -2756,10 +2756,10 @@
 }
 
 TypeLoc Sema::getReturnTypeLoc(FunctionDecl *FD) const {
-  TypeLoc TL = FD->getTypeSourceInfo()->getTypeLoc();
+  TypeLoc TL = FD->getTypeSourceInfo()->getTypeLoc().IgnoreParens();
   while (auto ATL = TL.getAs<AttributedTypeLoc>())
     TL = ATL.getModifiedLoc().IgnoreParens();
-  return TL.IgnoreParens().castAs<FunctionProtoTypeLoc>().getReturnLoc();
+  return TL.castAs<FunctionProtoTypeLoc>().getReturnLoc();
 }
 
 /// Deduce the return type for a function from a returned expression, per