[Patch] More responsive QUITs

[Tom Tromey]

>>>>> "Sterling" == Sterling Augustine <saugustine@google.com> writes:

Sterling> 2011-07-20  Sterling Augustine  <saugustine@google.com>
Sterling>        * psymtab.c (map_symbol_filenames_psymtab): Call QUIT.

I think this exposes gdb to a memory leak in
make_source_files_completion_list.

I think the bug is a QUIT can unwind:

   map_symbol_filenames_psymtab
-> map_partial_symbol_filenames
-> make_source_files_completion_list

... which does not use cleanups to protect the allocations it does.

Tom