clarify that this isn't lld.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169130 91177308-0d34-0410-b5e6-96231b3b80d8

CODE_OWNERS.TXT

@@ -115,4 +115,4 @@ D: Instruction Scheduling
 
 N: Bill Wendling
 E: wendling@apple.com
-D: libLTO & Linker
+D: libLTO & IR Linker