add a new Sema::CurFunctionNeedsScopeChecking bool that is used to avoid 
calling into the jump checker when a function or method is known to contain
no VLAs or @try blocks.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@69509 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaStmt.cpp b/lib/Sema/SemaStmt.cpp
index 4a5facb..35dffa1 100644
--- a/lib/Sema/SemaStmt.cpp
+++ b/lib/Sema/SemaStmt.cpp
@@ -1056,6 +1056,7 @@
 Action::OwningStmtResult
 Sema::ActOnObjCAtTryStmt(SourceLocation AtLoc,
                          StmtArg Try, StmtArg Catch, StmtArg Finally) {
+  CurFunctionNeedsScopeChecking = true;
   return Owned(new (Context) ObjCAtTryStmt(AtLoc,
                                         static_cast<Stmt*>(Try.release()),
                                         static_cast<Stmt*>(Catch.release()),