sparc: Remove TARGET_SUN_TLS

sparc: Remove TARGET_SUN_TLS

All remaining uses of TARGET_SUN_TLS refer to either

* a feature missing in Solaris as:

  Lack of support for R_SPARC_TLS_DTPOFF{32,64}: while Solaris ld
  supports those just fine, I know of no Solaris as syntax for them.

* workarounds for bugs in Solaris as in sparc_tls_got,
  sparc_legitimize_tls_address, and the tls_delay_slot attribute

Therefor this patch replaces all uses of TARGET_SUN_TLS with
!HAVE_GNU_AS.

Bootstrapped without regressions on sparc-sun-solaris2.11,
sparcv9-sun-solaris2.11 (as and gas), and sparc64-unknown-linux-gnu.

2026-01-14  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc:
	* config/sparc/sparc.h (TARGET_SUN_TLS): Remove.
	* config/sparc/sol2.h (TARGET_SUN_TLS): Likewise.

	* config/sparc/sparc.cc (TARGET_ASM_OUTPUT_DWARF_DTPREL): Guard
	with HAVE_GNU_AS.
	(sparc_tls_got): Guard with !HAVE_GNU_AS.
	(sparc_legitimize_tls_address): Likewise.
	* config/sparc/sparc.md ("tls_delay_slot"): Likewise.
	("@tie_add<P:mode>"): Likewise.