S/390: Fix missing .size directives.

It seems at some point the .size hook was hijacked to emit some
machine-specific directives, and the actual .size directive was
forgotten.  This caused problems for split-stack support, since
linker couldn't scan the function body for non-split-stack calls.

gcc/ChangeLog:

	* config/s390/s390.c (s390_asm_declare_function_size): Add code
	to actually emit the .size directive.

From-SVN: r232669

gcc/ChangeLog

+2016-01-21  Marcin Kościelnicki  <koriakin@0x04.net>
+
+	* config/s390/s390.c (s390_asm_declare_function_size): Add code
+	to actually emit the .size directive.
+
 2016-01-21   Stefan Sørensen  <stefan.sorensen@spectralink.com>
 	     Jakub Jelinek  <jakub@redhat.com>
 

gcc/config/s390/s390.c

@@ -6834,8 +6834,10 @@ s390_asm_output_function_prefix (FILE *asm_out_file,
 
 void
 s390_asm_declare_function_size (FILE *asm_out_file,
-				const char *fnname ATTRIBUTE_UNUSED, tree decl)
+				const char *fnname, tree decl)
 {
+  if (!flag_inhibit_size_directive)
+    ASM_OUTPUT_MEASURED_SIZE (asm_out_file, fnname);
   if (DECL_FUNCTION_SPECIFIC_TARGET (decl) == NULL)
     return;
   fprintf (asm_out_file, "\t.machine pop\n");