Fix problematic TLS sequences for the Solaris linker

This is an old thinko pertaining to the interaction between TLS
sequences and delay slot filling: the compiler knows that it cannot
put instructions with TLS relocations into delay slots with the
original Sun TLS model, but it tests TARGET_SUN_TLS in this context,
which depends only on the assembler.  So if the compiler is configured
with the GNU assembler and the Solaris linker, then TARGET_GNU_TLS is
set instead and the limitation is not enforced.

	PR target/93704
	* config/sparc/sparc.c (eligible_for_call_delay): Test HAVE_GNU_LD
	in conjunction with TARGET_GNU_TLS in early return.

gcc/ChangeLog

+2020-02-14  Eric Botcazou  <ebotcazou@adacore.com>
+
+	PR target/93704
+	* config/sparc/sparc.c (eligible_for_call_delay): Test HAVE_GNU_LD in
+	conjunction with TARGET_GNU_TLS in early return.
+
 2020-02-14  Alexander Monakov  <amonakov@ispras.ru>
 
 	* rtlanal.c (rtx_cost): Handle a SET up front. Avoid division if

gcc/config/sparc/sparc.c

@@ -3959,11 +3959,8 @@ eligible_for_call_delay (rtx_insn *trial)
   if (get_attr_in_branch_delay (trial) == IN_BRANCH_DELAY_FALSE)
     return 0;
 
-  /* Binutils allows
-       call __tls_get_addr, %tgd_call (foo)
-        add %l7, %o0, %o0, %tgd_add (foo)
-     while Sun as/ld does not.  */
-  if (TARGET_GNU_TLS || !TARGET_TLS)
+  /* The only problematic cases are TLS sequences with Sun as/ld.  */
+  if ((TARGET_GNU_TLS && HAVE_GNU_LD) || !TARGET_TLS)
     return 1;
 
   pat = PATTERN (trial);