Fix obsolete comment. NFC

Both files mentioned in the comment now include TargetOpcodes.def. Just
mention that directly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@354316 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/Target/Target.td b/include/llvm/Target/Target.td
index 380e848..ba40767 100644
--- a/include/llvm/Target/Target.td
+++ b/include/llvm/Target/Target.td
@@ -908,7 +908,7 @@
 }
 
 // Standard Pseudo Instructions.
-// This list must match TargetOpcodes.h and CodeGenTarget.cpp.
+// This list must match TargetOpcodes.def.
 // Only these instructions are allowed in the TargetOpcode namespace.
 // Ensure mayLoad and mayStore have a default value, so as not to break
 // targets that set guessInstructionProperties=0. Any local definition of