[Patch] More responsive QUITs

[Sterling Augustine]

Hello,

Enclosed is a patch that adds calls to QUIT in various places which
makes GDB more responsive to CTRL-C. In particular, reading a symbol
file at start up can now be interrupted (although perhaps still not as
responsive as one might like), as well as various other long running
operations. I know at least two GDB developers have one or another of
these on their TODO lists.

All three of these calls to QUIT have relatively close cleanup handlers:

The new call in dwarf2_build_psymtabs is cleaned up by the handlers in
the same function.
Likewise for the new call in process_type_comp_unit, which is just a
level or two down.

The new call in map_symbol_filenames_psymtab occurs in a location
where I don't believe there could be any inconsistent state.

Comments?

Sterling

=-=-=-=-=-
2011-07-12  Sterling Augustine  <saugustine@google.com>

	* dwarf2read.c (process_type_comp_unit): Call QUIT.
	(dwarf2_build_psymtabs_hard): Likewise.
	* psymtab.c (map_symbol_filenames_psymtab): Likewise.
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