Implement function-try-blocks. However, there's a very subtle bug that I can't track down.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70155 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGObjC.cpp b/lib/CodeGen/CGObjC.cpp
index df49c70..de89f0d 100644
--- a/lib/CodeGen/CGObjC.cpp
+++ b/lib/CodeGen/CGObjC.cpp
@@ -129,7 +129,7 @@
     DebugInfo = CGM.getDebugInfo();
   StartObjCMethod(OMD, OMD->getClassInterface());
   EmitStmt(OMD->getBody(getContext()));
-  FinishFunction(cast<CompoundStmt>(OMD->getBody(getContext()))->getRBracLoc());
+  FinishFunction(OMD->getBodyRBrace(getContext()));
 }
 
 // FIXME: I wasn't sure about the synthesis approach. If we end up