[arm] Handle 32 and 128 bit FP stack moves.

It seems there was a typo which meant we didn't generate any code for 32 and 128
bit slot to slot moves.

Bug: 
Change-Id: Ia6982ec92471d16541d8ee873e1de33e4f46e77a
Reviewed-on: https://chromium-review.googlesource.com/566812Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Pierre Langlois <pierre.langlois@arm.com>
Cr-Commit-Position: refs/heads/master@{#46579}

src/compiler/arm/code-generator-arm.cc

@@ -3045,7 +3045,7 @@ void CodeGenerator::AssembleMove(InstructionOperand* source,
         __ vld1(Neon8, NeonListOperand(dst.low(), 2),
                 NeonMemOperand(kScratchReg));
       }
-    } else if (rep == MachineRepresentation::kFloat64) {
+    } else {
       DCHECK(destination->IsFPStackSlot());
       if (rep == MachineRepresentation::kFloat64) {
         DwVfpRegister temp = kScratchDoubleReg;