Rename lisp-like functions as suggested by Gabor Greif as loooong time
ago.  This is both easier to learn and easier to read.

llvm-svn: 123001
diff --git a/llvm/utils/TableGen/Record.h b/llvm/utils/TableGen/Record.h
index 307594f..f3a5df2 100644
--- a/llvm/utils/TableGen/Record.h
+++ b/llvm/utils/TableGen/Record.h
@@ -811,7 +811,7 @@
 ///
 class UnOpInit : public OpInit {
 public:
-  enum UnaryOp { CAST, CAR, CDR, LNULL };
+  enum UnaryOp { CAST, HEAD, TAIL, EMPTY };
 private:
   UnaryOp Opc;
   Init *LHS;