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[binutils-gdb] Enable software single stepping for while-stepping actions in GDBServer

*** TEST RESULTS FOR COMMIT 7fe5e27e9d63b065731b1b0b69ffd344942f4f39 ***

Author: Antoine Tremblay <antoine.tremblay@ericsson.com>
Branch: master
Commit: 7fe5e27e9d63b065731b1b0b69ffd344942f4f39

Enable software single stepping for while-stepping actions in GDBServer

This patch enables software single stepping if the targets support it,
to do while-stepping actions.

No regressions, tested on ubuntu 14.04 ARMv7 and x86.
With gdbserver-{native,extended} / { -marm -mthumb }

gdb/gdbserver/ChangeLog:

	* linux-low.c (single_step): New function.
	(linux_resume_one_lwp_throw): Call single_step.
	(start_step_over): Likewise.
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