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[binutils-gdb] btrace: split record_btrace_step_thread

*** TEST RESULTS FOR COMMIT d825d248105e1c9a13fef4a35e76b6f4912e3792 ***

Author: Markus Metzger <markus.t.metzger@intel.com>
Branch: master
Commit: d825d248105e1c9a13fef4a35e76b6f4912e3792

btrace: split record_btrace_step_thread

The code for BTHR_STEP and BTHR_CONT is fairly similar.  Extract the common
parts into a new function record_btrace_single_step_forward.  The function
returns TARGET_WAITKIND_SPURIOUS to indicate that the single-step completed
without triggering a trap.

Same for BTHR_RSTEP and BTHR_RCONT.

gdb/
	* record-btrace.c (btrace_step_spurious)
	(record_btrace_single_step_forward)
	(record_btrace_single_step_backward): New.
	(record_btrace_step_thread): Call record_btrace_single_step_forward
	and record_btrace_single_step_backward.
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