PR22263 ld test

A number of targets that I test regularly fail the "Build pr22263-1"
test for various reasons.

arm-linux-gnueabi: "undefined reference to `__aeabi_read_tp'"
ia64-linux-gnu: "Explicit stops are ignored in auto mode"
m68k-linux-gnu: "undefined reference to `__m68k_read_tp'"
microblaze-linux-gnu: "undefined reference to `__tls_get_addr'"
nios2-linux-gnu, s390-linux-gnu and sh4-linux-gnu have a tprel reloc in .got
riscv64-linux-gnu has a dynamic relocation in text

So only riscv really fails the pr.  The rest fail due to test issues
or lack of a linker optimisation.  Lack of an optimisation isn't
really a fail, but it's worth keeping the test to ensure those
optimisations don't regress.  The xfail targets may not be an
exhaustive list.  This just tidies test results for those for which I
have cross compilers installed.

	PR 22263
	* testsuite/ld-elf/tls.exp: Split pr22263 test into two parts,
	one to check for -z text errors, the other to check tprel
	linker optimisation.  Supply needed symbols and assembler flags.
	xfail the linker optimisation on targets known to fail.

ld/testsuite/ld-elf/tls.exp

@@ -37,17 +37,43 @@ if { ![check_compiler_available] } {
 set AFLAGS_PIC ""
 if [istarget "sparc*-*-*"] {
     append AFLAGS_PIC " -K PIC -Av9"
+} elseif [istarget ia64-*-*] {
+    append AFLAGS_PIC " -x"
+}
+
+set ldflags "-pie -e _start -z text"
+if [istarget arm*-*-*] {
+    append ldflags " --defsym __aeabi_read_tp=0"
+} elseif [istarget m68*-*-*] {
+    append ldflags " --defsym __m68k_read_tp=0"
+} elseif [istarget microblaze-*-*] {
+    append ldflags " --defsym __tls_get_addr=0"
 }
 
 run_ld_link_tests [list \
     [list \
-	"Build pr22263-1" \
-	"-pie -e _start -z text" \
+	"pr22263-1 -z text" \
+	$ldflags \
 	"" \
 	"$AFLAGS_PIC" \
 	{ pr22263-1a.c pr22263-1b.c } \
-	{{readelf -r pr22263-1.rd}} \
+	{} \
 	"pr22263-1" \
 	"-fPIE -O2 $NOSANITIZE_CFLAGS" \
     ] \
 ]
+
+if [file exists tmpdir/pr22263-1] {
+    run_ld_link_tests [list \
+	[list \
+	    "pr22263-1 tprel optimisation" \
+	    $ldflags \
+	    "tmpdir/pr22263-1a.o tmpdir/pr22263-1b.o" \
+	    "" \
+	    {} \
+	    {{readelf -r pr22263-1.rd}} \
+	    "pr22263-1" \
+	    "" \
+	] \
+    ] ia64-*-* m68*-*-* nios2-*-* s390-*-* sh*-*-*
+}