gdb/

gdb/
	Fix step_resume_breakpoint unsaved during an infcall.
	* gdbthread.h (struct thread_control_state): Move here field
	step_resume_breakpoint ...
	(struct thread_info): ... from here.
	* infrun.c (save_infcall_control_state): Reset
	control.step_resume_breakpoint to NULL.
	(restore_infcall_control_state, discard_infcall_control_state): Delete
	control.step_resume_breakpoint.
	* arm-linux-tdep.c, infrun.c, thread.c: Update all the references to
	the moved field.

gdb/testsuite/
	Fix step_resume_breakpoint unsaved during an infcall.
	* gdb.base/step-resume-infcall.exp: New file.
	* gdb.base/step-resume-infcall.c: New file.