various minor obvious fixes in th track-macro-expansion code

[Manuel López-Ibáñez]

Hi Dodji,

I was going to commit this as obvious, but I want to make sure that it
doesn't conflict with your new track-macro-expansion patches. It can
also wait until you commit all your patches.

Cheers,

Manuel.

2012-04-18  Manuel López-Ibáñez  <m...@gcc.gnu.org>

        * tree-diagnostic.c (maybe_unwind_expanded_macro_loc): Fix
        comment. Delete unused parameter first_exp_point_map.
        (virt_loc_aware_diagnostic_finalizer): Update call.
libcpp/
        * line-map.c (linemap_resolve_location): Synchronize comments with
        those in line-map.h.
        * include/line-map.h (linemap_resolve_location): Fix spelling in
        comment.

macro-fixes.diff
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