[binutils-gdb] btrace: extract the breakpoint check from record_btrace_step_thread

[sergiodj+buildbot at redhat dot com]

*** TEST RESULTS FOR COMMIT 3c615f99d3923df7dfa94c6587733c682efbbc78 ***

Author: Markus Metzger <markus.t.metzger@intel.com>
Branch: master
Commit: 3c615f99d3923df7dfa94c6587733c682efbbc78

btrace: extract the breakpoint check from record_btrace_step_thread

There are two places where record_btrace_step_thread checks for a breakpoint
at the current replay position.  Move this code into its own function.

gdb/
	* record-btrace.c (record_btrace_replay_at_breakpoint): New.
	(record_btrace_step_thread): Call record_btrace_replay_at_breakpoint.