Clean ups, and taught the instruction selector about immediate forms

llvm-svn: 19816
diff --git a/llvm/lib/Target/Alpha/AlphaTargetMachine.h b/llvm/lib/Target/Alpha/AlphaTargetMachine.h
index 2eb1e21..75d1353 100644
--- a/llvm/lib/Target/Alpha/AlphaTargetMachine.h
+++ b/llvm/lib/Target/Alpha/AlphaTargetMachine.h
@@ -1,4 +1,4 @@
-//===-- AlphaTargetMachine.h - Define TargetMachine for PowerPC -*- C++ -*-=//
+//===-- AlphaTargetMachine.h - Define TargetMachine for Alpha -*- C++ -*-----=//
 // 
 //                     The LLVM Compiler Infrastructure
 //