ARM process record: median instructions

ARM process record: median instructions

This patch is to support some ARM median instructions in process
record.  With this patch applied, these fails are fixed:

 -FAIL: gdb.reverse/break-precsave.exp: run to end of main
 -FAIL: gdb.reverse/break-precsave.exp: go to end of main forward
 -FAIL: gdb.reverse/break-precsave.exp: end of record log
 -FAIL: gdb.reverse/break-reverse.exp: continue to breakpoint: end
 -FAIL: gdb.reverse/break-reverse.exp: end of record log
 -FAIL: gdb.reverse/until-precsave.exp: run to end of main
 -FAIL: gdb.reverse/until-precsave.exp: advance to marker2
 -FAIL: gdb.reverse/until-precsave.exp: until func, not called by current frame
 -FAIL: gdb.reverse/until-precsave.exp: reverse-advance to marker2
 -FAIL: gdb.reverse/until-precsave.exp: reverse-finish from marker2
 -FAIL: gdb.reverse/until-precsave.exp: reverse-advance to final return of factorial
 -FAIL: gdb.reverse/until-precsave.exp: reverse-until to entry of factorial
 -FAIL: gdb.reverse/until-reverse.exp: advance to marker2
 -FAIL: gdb.reverse/until-reverse.exp: until func, not called by current frame
 -FAIL: gdb.reverse/until-reverse.exp: reverse-advance to marker2
 -FAIL: gdb.reverse/until-reverse.exp: reverse-finish from marker2
 -FAIL: gdb.reverse/until-reverse.exp: reverse-advance to final return of factorial
 -FAIL: gdb.reverse/until-reverse.exp: reverse-until to entry of factorial

gdb:

2016-03-21  Yao Qi  <yao.qi@linaro.org>

	* arm-tdep.c (arm_record_media): New.
	(arm_record_ld_st_reg_offset): Call arm_record_media.