Re-commit "[Temporary] Add an ExprWithCleanups for each C++ MaterializeTemporaryExpr."

Since D21243 fixes relative clang-tidy tests.

This reverts commit a71d9fbd41e99def9159af2b01ef6509394eaeed.

llvm-svn: 273312
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index 291b9fa..5f28aa3 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -3801,6 +3801,10 @@
     }
     return true;
   }
+  if (auto *ExprTemp = dyn_cast<ExprWithCleanups>(S))
+    if (!ExprTemp->cleanupsHaveSideEffects())
+      S = ExprTemp->getSubExpr();
+
   InitSrcRange = S->getSourceRange();
   if (Expr *E = dyn_cast<Expr>(S))
     S = E->IgnoreParens();
@@ -3988,6 +3992,10 @@
     SemaRef.Diag(DefaultLoc, diag::err_omp_loop_not_canonical_incr) << LCDecl;
     return true;
   }
+  if (auto *ExprTemp = dyn_cast<ExprWithCleanups>(S))
+    if (!ExprTemp->cleanupsHaveSideEffects())
+      S = ExprTemp->getSubExpr();
+
   IncrementSrcRange = S->getSourceRange();
   S = S->IgnoreParens();
   if (auto UO = dyn_cast<UnaryOperator>(S)) {