gcc: xtensa: fix PR target/102115

2021-09-07  Takayuki 'January June' Suwa  <jjsuwa_sys3175@yahoo.co.jp>
gcc/
	PR target/102115
	* config/xtensa/xtensa.c (xtensa_emit_move_sequence): Add
	'CONST_INT_P (src)' to the condition of the block that tries to
	eliminate literal when loading integer contant.

(cherry picked from commit b552c4e)

gcc/config/xtensa/xtensa.c

@@ -1087,7 +1087,8 @@ xtensa_emit_move_sequence (rtx *operands, machine_mode mode)
 	{
 	  /* Try to emit MOVI + SLLI sequence, that is smaller
 	     than L32R + literal.  */
-	  if (optimize_size && mode == SImode && register_operand (dst, mode))
+	  if (optimize_size && mode == SImode && CONST_INT_P (src)
+	      && register_operand (dst, mode))
 	    {
 	      HOST_WIDE_INT srcval = INTVAL (src);
 	      int shift = ctz_hwi (srcval);