Add 'exception handling' to my description.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150678 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/CREDITS.TXT b/CREDITS.TXT
index 209a87f..22d7985 100644
--- a/CREDITS.TXT
+++ b/CREDITS.TXT
@@ -376,6 +376,7 @@
 
 N: Bill Wendling
 E: wendling@apple.com
+D: Exception handling
 D: Bunches of stuff
 
 N: Bob Wilson