Relax store_bit_field call in store_expr

store_bit_field already takes a poly_uint64 size, so we can relax the
INTVAL to rtx_to_poly_int64.  This is tested by the SVE ACLE patches.

2019-10-11  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* expr.c (store_expr): Use rtx_to_poly_int64 rather than
	INTVAL when calling store_bit_field.

From-SVN: r276888

gcc/ChangeLog

+2019-10-11  Richard Sandiford  <richard.sandiford@arm.com>
+
+	* expr.c (store_expr): Use rtx_to_poly_int64 rather than
+	INTVAL when calling store_bit_field.
+
 2019-10-11  Wilco Dijkstra  <wdijkstr@arm.com>
 
 	* config/arm/arm.h (HONOR_REG_ALLOC_ORDER): Set when optimizing for

gcc/expr.c

@@ -5790,7 +5790,8 @@ store_expr (tree exp, rtx target, int call_param_p,
 		copy_blkmode_from_reg (target, temp, TREE_TYPE (exp));
 	      else
 		store_bit_field (target,
-				 INTVAL (expr_size (exp)) * BITS_PER_UNIT,
+				 rtx_to_poly_int64 (expr_size (exp))
+				 * BITS_PER_UNIT,
 				 0, 0, 0, GET_MODE (temp), temp, reverse);
 	    }
 	  else