[NFC] Refactor representation of materialized temporaries

Summary:
this patch refactor representation of materialized temporaries to prevent an issue raised by rsmith in https://reviews.llvm.org/D63640#inline-612718

Reviewers: rsmith, martong, shafik

Reviewed By: rsmith

Subscribers: thakis, sammccall, ilya-biryukov, rnkovacs, arphaman, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D69360
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index 384e8f7..214378a96 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -417,7 +417,7 @@
 
 LValue CodeGenFunction::
 EmitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *M) {
-  const Expr *E = M->GetTemporaryExpr();
+  const Expr *E = M->getSubExpr();
 
   assert((!M->getExtendingDecl() || !isa<VarDecl>(M->getExtendingDecl()) ||
           !cast<VarDecl>(M->getExtendingDecl())->isARCPseudoStrong()) &&