[wasm-simd][scalar-lowering] Remove incorrect DCHECK

The first operand of the select op isn't restricted to any particular
replacement SimdType, since we can convert any type to Int32x4.

Change-Id: I1821b2ebdc1a192518a2ecc0cb13951a98bb3337
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2534211Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71167}

src/compiler/simd-scalar-lowering.cc

@@ -2106,9 +2106,6 @@ void SimdScalarLowering::LowerNode(Node* node) {
     }
     case IrOpcode::kS128Select: {
       DCHECK_EQ(3, node->InputCount());
-      DCHECK(ReplacementType(node->InputAt(0)) == SimdType::kInt32x4 ||
-             ReplacementType(node->InputAt(0)) == SimdType::kInt16x8 ||
-             ReplacementType(node->InputAt(0)) == SimdType::kInt8x16);
       Node** boolean_input =
           GetReplacementsWithType(node->InputAt(0), rep_type);
       Node** rep_left = GetReplacementsWithType(node->InputAt(1), rep_type);