Do not emit USE on a LABEL_REF

From-SVN: r13695

gcc/config/rs6000/rs6000.md

@@ -5164,8 +5164,12 @@
     {
       /* Emit a USE operation so that the constant isn't deleted if
 	 expensive optimizations are turned on because nobody
-	 references it */
-      emit_insn (gen_rtx (USE, VOIDmode, operands[1]));
+	 references it.  This should only be done for operands that
+	 contain SYMBOL_REFs with CONSTANT_POOL_ADDRESS_P set.
+	 This should not be done for operands that contain LABEL_REFs.
+	 For now, we just handle the obvious case.  */
+      if (GET_CODE (operands[1]) != LABEL_REF)
+	emit_insn (gen_rtx (USE, VOIDmode, operands[1]));
 
       /* If we are to limit the number of things we put in the TOC and
 	 this is a symbol plus a constant we can add in one insn,