[PATCH] Add support to print version.

[Rui Ueyama]

LGTM with this nit.

================
Comment at: lib/Config/Makefile:1
@@ -1,2 +1,2 @@
-##===- lib/Makefile ----------------------------------------*- Makefile -*-===##
+##===- lld/lib/Config/Makefile -----------------------------*- Makefile -*-===##
 #
----------------
Remove "lld/" from this line.

http://reviews.llvm.org/D5641