add a statistics command to compiler

just to see how many objects make up a binary

lib/risc/text_writer.rb

@@ -7,7 +7,7 @@ module Risc
   # into one stream or binary text object. This is then written to an ELF text section.
   #
   # A word about positions: The c world has a thing called position independent code, and
-  # baically we follw that idea. Code (ie jumps and constant loads) are all relative.
+  # basically we follw that idea. Code (ie jumps and constant loads) are all relative.
   # But we have pointers. In C the linker takes care of bending those, we have to
   # do that ourselves, in write_ref. That's why we need the load adddess and basically
   # we just add it to pointers.