Dump stats about hottest hash tables when -fmem-report

[Dimitrios Apostolou]

I forgot to include the dwarf2out.c:file_table. Stats are printed when -g. 
See attached patch. Additional Changelog:

         * dwarf2out.c (dwarf2out_finish): Call htab_dump_statistics() if
         -fmem-report.


Dimitris

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