Watch and TV OS: wire up basic ABI choices

This sets the mostly expected Darwin default ABI options for these two
platforms. Active changes from these defaults for watchOS are in a later patch.

llvm-svn: 251708
diff --git a/clang/lib/CodeGen/CGException.cpp b/clang/lib/CodeGen/CGException.cpp
index 2c1ede4..f5b4434 100644
--- a/clang/lib/CodeGen/CGException.cpp
+++ b/clang/lib/CodeGen/CGException.cpp
@@ -129,6 +129,7 @@
     return getCPersonality(T, L);
   case ObjCRuntime::MacOSX:
   case ObjCRuntime::iOS:
+  case ObjCRuntime::WatchOS:
     return EHPersonality::NeXT_ObjC;
   case ObjCRuntime::GNUstep:
     if (L.ObjCRuntime.getVersion() >= VersionTuple(1, 7))
@@ -160,6 +161,7 @@
   // function on targets using (backend-driven) SJLJ EH.
   case ObjCRuntime::MacOSX:
   case ObjCRuntime::iOS:
+  case ObjCRuntime::WatchOS:
     return EHPersonality::NeXT_ObjC;
 
   // In the fragile ABI, just use C++ exception handling and hope