Adding myself

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42869 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/CREDITS.TXT b/CREDITS.TXT
index a24d9f9..bf02b16 100644
--- a/CREDITS.TXT
+++ b/CREDITS.TXT
@@ -229,6 +229,10 @@
 E: sasanka@uiuc.edu
 D: Graph coloring register allocator for the Sparc64 backend
 
+N: Arnold Schwaighofer
+E: arnold.schwaighofer@gmail.com
+D: Tail call optimization for the x86 backend
+
 N: Anand Shukla
 E: ashukla@cs.uiuc.edu
 D: The `paths' pass