check_gc_sections_available: Mark z80 as not supported

[hjl@gnu-cfl-2 tmpdir]$ ../ld-new -V --gc-sections pr22319.o
GNU ld (GNU Binutils) 2.34.50.20200206
  Supported emulations:
   elf32z80
../ld-new: warning: gc-sections option ignored
../ld-new: warning: cannot find entry symbol _start; defaulting to 0000000000000100
[hjl@gnu-cfl-2 tmpdir]$

	* testsuite/lib/ld-lib.exp (check_gc_sections_available): Mark
	z80 as not supported.

ld/ChangeLog

@@ -1,3 +1,8 @@
+2020-02-07  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* testsuite/lib/ld-lib.exp (check_gc_sections_available): Mark
+	z80 as not supported.
+
 2020-02-06  Alan Modra  <amodra@gmail.com>
 
 	* testsuite/ld-ifunc/ifunc.exp: Enable for more targets, specifying

ld/testsuite/lib/ld-lib.exp

@@ -1062,7 +1062,8 @@ proc check_gc_sections_available { } {
 	    || [istarget pj*-*-*]
 	    || [istarget pru*-*-*]
 	    || [istarget s12z-*-*]
-	    || [istarget xgate-*-*] } {
+	    || [istarget xgate-*-*]
+	    || [istarget z80-*-*] } {
 	    set gc_sections_available_saved 0
 	    return 0
 	}