Rewrite arm_record_coproc_data_proc and arm_record_data_proc_misc_ld_str

When I triage some reverse debugging test fails on arm-linux, I find
arm_record_coproc_data_proc and arm_record_data_proc_misc_ld_str is not
friendly to instruction encoding on ARM ARM.  This patch rewrites them, in
a way match more closely to the manual.

gdb:

2018-02-01  Yao Qi  <yao.qi@linaro.org>

	* arm-tdep.c (arm_record_data_proc_misc_ld_str): Rewrite it.
	(arm_record_coproc_data_proc): Likewise.