Set bp_tgt->reqstd_address and bp_tgt->placed_size in record_full_insert_breakpoint

Set bp_tgt->reqstd_address and bp_tgt->placed_size in record_full_insert_breakpoint

I notice that bp_tgt won't be fully initialized if to_insert_breakpoint
isn't called in record_full_insert_breakpoint, and bp_tgt->reqstd_address
is zero, so an entry is added to record_full_breakpoints, but its address
is zero, which is wrong.  This patch is to call gdbarch_breakpoint_from_pc
in the else branch to set bp_tgt->reqstd_address and bp_tgt->placed_size.

gdb:

2016-04-07  Yao Qi  <yao.qi@linaro.org>

	* record-full.c (record_full_insert_breakpoint): Set
	bp_tgt->reqstd_address and bp_tgt->placed_size.