Make clang -cc1 disable Objective-C exceptions by default, and add a -fobjc-exceptions flag to turn them on.

Update all tests accordingly.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@126177 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaObjC/warn-unused-exception-param.m b/test/SemaObjC/warn-unused-exception-param.m
index f649f8c..221e16f 100644
--- a/test/SemaObjC/warn-unused-exception-param.m
+++ b/test/SemaObjC/warn-unused-exception-param.m
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -verify -Wunused-exception-parameter %s
+// RUN: %clang_cc1 -fsyntax-only -verify -fobjc-exceptions -Wunused-exception-parameter %s
 void  f0() {
   @try {} @catch(id a) {} // expected-warning{{unused exception parameter 'a'}}
 }