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

Update all tests accordingly.

llvm-svn: 126177
diff --git a/clang/test/CodeGenObjC/exceptions.m b/clang/test/CodeGenObjC/exceptions.m
index 31805cb..d378f84 100644
--- a/clang/test/CodeGenObjC/exceptions.m
+++ b/clang/test/CodeGenObjC/exceptions.m
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -fexceptions -O2 -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -fexceptions -fobjc-exceptions -O2 -o - %s | FileCheck %s
 //
 // <rdar://problem/7471679> [irgen] [eh] Exception code built with clang (x86_64) crashes