[rl78] verify clobbers

[DJ Delorie]

Minor tweak to make sure we don't try to take the REGNO of a MEM.
Committed.

        * config/rl78/rl78.c (rl78_propogate_register_origins): Verify
        that CLOBBERs are REGs before propogating their values.

Index: config/rl78/rl78.c
===================================================================
--- config/rl78/rl78.c  (revision 206866)
+++ config/rl78/rl78.c  (working copy)
@@ -3423,13 +3423,14 @@ rl78_propogate_register_origins (void)
          pat = PATTERN (insn);
 
          if (GET_CODE (pat) == PARALLEL)
            {
              rtx clobber = XVECEXP (pat, 0, 1);
              pat = XVECEXP (pat, 0, 0);
-             if (GET_CODE (clobber) == CLOBBER)
+             if (GET_CODE (clobber) == CLOBBER
+                 && GET_CODE (XEXP (clobber, 0)) == REG)
                {
                  int cr = REGNO (XEXP (clobber, 0));
                  int mb = GET_MODE_SIZE (GET_MODE (XEXP (clobber, 0)));
                  if (dump_file)
                    fprintf (dump_file, "reset origins of %d regs at %d\n", mb, 
cr);
                  for (i = 0; i < mb; i++)
@@ -3566,13 +3567,14 @@ rl78_propogate_register_origins (void)
                            origins[i] = i;
                            age[i] = 0;
                          }
                    }
                }
            }
-         else if (GET_CODE (pat) == CLOBBER)
+         else if (GET_CODE (pat) == CLOBBER
+                  && GET_CODE (XEXP (pat, 0)) == REG)
            {
              if (REG_P (XEXP (pat, 0)))
                {
                  unsigned int reg = REGNO (XEXP (pat, 0));
 
                  origins[reg] = reg;