Revert "[WASM SIMD] Store simd lowering compare ops result as -1 instead of 1"

This reverts commit 2f83ffa9.

Reason for revert: Bots failed after this landed. Need to figure out if it is related.

Original change's description:
> [WASM SIMD] Store simd lowering compare ops result as -1 instead of 1
> 
> BUG: v8:6020
> Change-Id: I3148511233ee6f89acd71644e0c43f72ccc5eef0
> Reviewed-on: https://chromium-review.googlesource.com/538160
> Reviewed-by: Bill Budge <bbudge@chromium.org>
> Reviewed-by: Mircea Trofin <mtrofin@chromium.org>
> Commit-Queue: Aseem Garg <aseemgarg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#46071}

TBR=bbudge@chromium.org,gdeepti@chromium.org,mtrofin@chromium.org,aseemgarg@chromium.org

Change-Id: I300eadd02ab2d20817461e6f9a2c23c138b42256
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/541717Reviewed-by: Aseem Garg <aseemgarg@chromium.org>
Commit-Queue: Aseem Garg <aseemgarg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46072}

src/compiler/simd-scalar-lowering.h

@@ -73,9 +73,8 @@ class SimdScalarLowering {
                    const Operator* load_op, SimdType type);
   void LowerStoreOp(MachineRepresentation rep, Node* node,
                     const Operator* store_op, SimdType rep_type);
-  void LowerBinaryOp(Node* node, SimdType input_rep_type, const Operator* op);
-  void LowerCompareOp(Node* node, SimdType input_rep_type, const Operator* op,
-                      bool invert_inputs = false);
+  void LowerBinaryOp(Node* node, SimdType input_rep_type, const Operator* op,
+                     bool invert_inputs = false);
   Node* FixUpperBits(Node* input, int32_t shift);
   void LowerBinaryOpForSmallInt(Node* node, SimdType input_rep_type,
                                 const Operator* op);
@@ -89,7 +88,6 @@ class SimdScalarLowering {
   void LowerShiftOp(Node* node, SimdType type);
   Node* BuildF64Trunc(Node* input);
   void LowerNotEqual(Node* node, SimdType input_rep_type, const Operator* op);
-  MachineType MachineTypeFrom(SimdType simdType);
 
   JSGraph* const jsgraph_;
   NodeMarker<State> state_;