LoongArch: Merge template got_load_tls_{ld/gd/le/ie}.

LoongArch: Merge template got_load_tls_{ld/gd/le/ie}.

gcc/ChangeLog:

	* config/loongarch/loongarch.cc (loongarch_load_tls):
	Load all types of tls symbols through one function.
	(loongarch_got_load_tls_gd): Delete.
	(loongarch_got_load_tls_ld): Delete.
	(loongarch_got_load_tls_ie): Delete.
	(loongarch_got_load_tls_le): Delete.
	(loongarch_call_tls_get_addr): Modify the called function name.
	(loongarch_legitimize_tls_address): Likewise.
	* config/loongarch/loongarch.md (@got_load_tls_gd<mode>): Delete.
	(@load_tls<mode>): New template.
	(@got_load_tls_ld<mode>): Delete.
	(@got_load_tls_le<mode>): Delete.
	(@got_load_tls_ie<mode>): Delete.