Yao Qi b5bee91426 Return zero in can_single_step_to_signal_handler for nios2-*-* target
nios2 uses software single step, so GDB is unable to single step to
the signal handler.  In order to reflect this, teach
can_single_step_to_signal_handler to return zero for nios2 target.

gdb/testsuite:

2014-03-27  Yao Qi  <yao@codesourcery.com>

	* lib/gdb.exp (can_single_step_to_signal_handler): Return zero
	if target is nios2-*-*.
2014-03-27 16:34:35 +08:00
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