Small housekeeping work in SPARC back-end

Small housekeeping work in SPARC back-end

gcc/
	* config/sparc/sparc.c (gen_load_pcrel_sym): Delete.
	(load_got_register): Do the PIC dance here.
	(sparc_legitimize_tls_address): Simplify.
	(sparc_emit_probe_stack_range): Likewise.
	(sparc32_initialize_trampoline): Likewise.
	(sparc64_initialize_trampoline): Likewise.
	* config/sparc/sparc.md (load_pcrel_sym<P:mode>): Add @ marker.
	(probe_stack_range<P:mode>): Likewise.
	(flush<P:mode>): Likewise.
	(tgd_hi22<P:mode>): Likewise.
	(tgd_lo10<P:mode>): Likewise.
	(tgd_add<P:mode>): Likewise.
	(tgd_call<P:mode>): Likewise.
	(tldm_hi22<P:mode>): Likewise.
	(tldm_lo10<P:mode>): Likewise.
	(tldm_add<P:mode>): Likewise.
	(tldm_call<P:mode>): Likewise.
	(tldo_hix22<P:mode>): Likewise.
	(tldo_lox10<P:mode>): Likewise.
	(tldo_add<P:mode>): Likewise.
	(tie_hi22<P:mode>): Likewise.
	(tie_lo10<P:mode>): Likewise.
	(tie_add<P:mode>): Likewise.
	(tle_hix22<P:mode>): Likewise.
	(tle_lox10<P:mode>): Likewise.
	(stack_protect_setsi): Rename to...
	(stack_protect_set32): ...this.
	(stack_protect_setdi): Rename to...
	(stack_protect_set64): ...this.
	(stack_protect_set): Adjust calls to above.
	(stack_protect_testsi): Rename to...
	(stack_protect_test32): ...this.
	(stack_protect_testdi): Rename to...
	(stack_protect_test64): ...this.
	(stack_protect_test): Adjust calls to above.