testsuite: extend timeout into all gm2 tests

testsuite: extend timeout into all gm2 tests

Add timeout capability to gm2-torture.exp.  Also add a simple
gm2_push_timeout/gm2_pop timeout facility and calibrate all
tests to use the default of 10 seconds.  15 seconds (for the
coroutine tests) and 60 seconds for whole program optimization.

gcc/testsuite/ChangeLog:

	* gm2/coroutines/pim/run/pass/coroutines-pim-run-pass.exp
	(timeout-dg.exp): Load.
	Call gm2_push_timeout 15.
	Call gm2_pop_timeout at the end.
	* gm2/link/min/pass/link-min-pass.exp: Set path
	argument to "".
	* gm2/switches/whole-program/pass/run/switches-whole-program-pass-run.exp:
	Call gm2_push_timeout 60.
	Call gm2_pop_timeout at the end.
	* lib/gm2-torture.exp (gm2_previous_timeout): Set to 10 or
	individual_timeout.
	Configure dejagnu to timeout for 10 seconds.
	(gm2_push_timeout): New proc.
	(gm2_pop_timeout): New proc.
	* lib/gm2.exp (gm2_previous_timeout): Set to 10 or
	individual_timeout.
	Configure dejagnu to timeout for 10 seconds.
	(gm2_push_timeout): New proc.
	(gm2_pop_timeout): New proc.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>