[ARM] Fix arm bootstrap failure due to -Werror=shift-negative-value

	* config/arm/arm.c (arm_gen_constant): Use HOST_WIDE_INT_M1U instead
	of -1 when shifting.  Change type of val to unsigned HOST_WIDE_INT.
	Update prototype.

From-SVN: r227798

gcc/ChangeLog

+2015-09-15  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	* config/arm/arm.c (arm_gen_constant): Use HOST_WIDE_INT_M1U instead
+	of -1 when shifting.  Change type of val to unsigned HOST_WIDE_INT.
+	Update prototype.
+
 2015-09-15  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/67470

gcc/config/arm/arm.c

@@ -95,7 +95,7 @@ static int arm_compute_static_chain_stack_bytes (void);
 static arm_stack_offsets *arm_get_frame_offsets (void);
 static void arm_add_gc_roots (void);
 static int arm_gen_constant (enum rtx_code, machine_mode, rtx,
-			     HOST_WIDE_INT, rtx, rtx, int, int);
+			     unsigned HOST_WIDE_INT, rtx, rtx, int, int);
 static unsigned bit_count (unsigned long);
 static unsigned feature_count (const arm_feature_set*);
 static int arm_address_register_rtx_p (rtx, int);
@@ -4229,8 +4229,8 @@ emit_constant_insn (rtx cond, rtx pattern)
 
 static int
 arm_gen_constant (enum rtx_code code, machine_mode mode, rtx cond,
-		  HOST_WIDE_INT val, rtx target, rtx source, int subtargets,
-		  int generate)
+		  unsigned HOST_WIDE_INT val, rtx target, rtx source,
+		  int subtargets, int generate)
 {
   int can_invert = 0;
   int can_negate = 0;
@@ -4600,7 +4600,7 @@ arm_gen_constant (enum rtx_code code, machine_mode mode, rtx cond,
 	  mvn	r0, r0, asl #12
 	  mvn	r0, r0, lsr #12  */
       if (set_sign_bit_copies > 8
-	  && (val & (-1 << (32 - set_sign_bit_copies))) == val)
+	  && (val & (HOST_WIDE_INT_M1U << (32 - set_sign_bit_copies))) == val)
 	{
 	  if (generate)
 	    {