arm: MVE Don't use lsll for 32-bit shifts scalar

After fixing the v[id]wdups using the "moving the wrap parameter" into the
top-end of a DImode operand using a shift, I noticed we were using lsll for
32-bit shifts in scalars, where we don't need to, as we can simply do a move,
  which is much better if we don't need to use the bottom part.

We can solve this in a better way, but for now this will do.

gcc/ChangeLog:
2020-04-07  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* config/arm/arm.d (ashldi3): Don't use lsll for constant 32-bit shifts.

gcc/ChangeLog

 2020-04-07  Andre Vieira  <andre.simoesdiasvieira@arm.com>
 
+	* config/arm/arm.d (ashldi3): Don't use lsll for constant 32-bit shifts.
+
+2020-04-07  Andre Vieira  <andre.simoesdiasvieira@arm.com>
+
 	* config/arm/arm_mve.h: Fix v[id]wdup intrinsics.
 	* config/arm/mve/md: Fix v[id]wdup patterns.
 

gcc/config/arm/arm.md

@@ -4422,7 +4422,8 @@
         operands[2] = force_reg (SImode, operands[2]);
 
       /* Armv8.1-M Mainline double shifts are not expanded.  */
-      if (arm_reg_or_long_shift_imm (operands[2], GET_MODE (operands[2])))
+      if (arm_reg_or_long_shift_imm (operands[2], GET_MODE (operands[2]))
+	  && (REG_P (operands[2]) || INTVAL(operands[2]) != 32))
         {
 	  if (!reg_overlap_mentioned_p(operands[0], operands[1]))
 	    emit_insn (gen_movdi (operands[0], operands[1]));