Allow a port to use pseudos as call args; don't put them in the fusage.

	* expr.c (use_reg_mode): Just return for pseudo registers.

From-SVN: r217198

gcc/ChangeLog

 2014-11-06  Bernd Schmidt  <bernds@codesourcery.com>
 
+	* expr.c (use_reg_mode): Just return for pseudo registers.
+
 	* combine.c (try_combine): Don't allow a call as one of the source
 	insns.
 

gcc/expr.c

@@ -2342,7 +2342,10 @@ copy_blkmode_to_reg (machine_mode mode, tree src)
 void
 use_reg_mode (rtx *call_fusage, rtx reg, machine_mode mode)
 {
-  gcc_assert (REG_P (reg) && REGNO (reg) < FIRST_PSEUDO_REGISTER);
+  gcc_assert (REG_P (reg));
+
+  if (!HARD_REGISTER_P (reg))
+    return;
 
   *call_fusage
     = gen_rtx_EXPR_LIST (mode, gen_rtx_USE (VOIDmode, reg), *call_fusage);