Rename the GCC Objective-C runtime to gcc from gnu-fragile and the GNUstep
runtime to gnustep from gnu.  Fix EH for the GCC runtime.

llvm-svn: 159684
diff --git a/clang/lib/CodeGen/CGObjCMac.cpp b/clang/lib/CodeGen/CGObjCMac.cpp
index 3eb5d52..3b7c238 100644
--- a/clang/lib/CodeGen/CGObjCMac.cpp
+++ b/clang/lib/CodeGen/CGObjCMac.cpp
@@ -6389,8 +6389,8 @@
   case ObjCRuntime::iOS:
     return new CGObjCNonFragileABIMac(CGM);
 
-  case ObjCRuntime::GNU:
-  case ObjCRuntime::FragileGNU:
+  case ObjCRuntime::GNUstep:
+  case ObjCRuntime::GCC:
     llvm_unreachable("these runtimes are not Mac runtimes");
   }
   llvm_unreachable("bad runtime");