PATCH: Remove the `q' suffix in x86_64 PTR_MANGLE/PTR_DEMANGLE

[Roland McGrath]

> Here is the updated patch to use LP_SIZE.  It is consistent
> between asm statement and asm code.  But I don't mind to use
> sizeof (void *) in asm statement.

Oh, I had forgotten there was a pure-assembly version.
I guess it makes sense to keep it consistent.

But this can't go in until we hash out your set of macros, which requires
more consideration than this change alone does.