update my credits entry per clattner's request!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27582 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/CREDITS.TXT b/CREDITS.TXT
index c2e2041..78adb52 100644
--- a/CREDITS.TXT
+++ b/CREDITS.TXT
@@ -18,7 +18,8 @@
 
 N: Nate Begeman
 E: natebegeman@mac.com
-D: Primary PowerPC backend developer
+D: PowerPC backend developer
+D: Target-independent code generator and analysis improvements
 
 N: Daniel Berlin
 E: dberlin@dberlin.org