gold/s390: Fix compilation on gcc 4.4

gold/s390: Fix compilation on gcc 4.4

gold/ChangeLog:

	PR/19960
	* s390.cc (Target_s390::ss_code_st_r14): Removed.
	(Target_s390::ss_code_l_r14): Removed.
	(Target_s390::ss_code_ear): Removed.
	(Target_s390::ss_code_c): Removed.
	(Target_s390::ss_match_st_r14): New function.
	(Target_s390::ss_match_l_r14): New function.
	(Target_s390::ss_match_mcount): Call ss_match_{l,st}_r14 instead
	of matching code directly.
	(Target_s390::ss_match_ear): New function.
	(Target_s390::ss_match_c): New function.
	(Target_s390::do_calls_non_split): Call ss_match_{ear,c} instead
	of matching code directly.