[instruction-selector-x64] Remove over-restrictive check

Change-Id: I6a220b6043da8f9c8c036c92e3f4da6ca7d801d4
Bug: v8:8344
Reviewed-on: https://chromium-review.googlesource.com/c/1306436Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57111}

src/compiler/x64/instruction-selector-x64.cc

@@ -1727,14 +1727,12 @@ void VisitWordCompare(InstructionSelector* selector, Node* node,
   // values to Word32 range, no need to do that explicitly.
   if (opcode == kX64Cmp32 || opcode == kX64Test32) {
     if (left->opcode() == IrOpcode::kTruncateInt64ToInt32 &&
-        selector->CanCover(node, left) &&
-        selector->CanCover(left, left->InputAt(0))) {
+        selector->CanCover(node, left)) {
       left = left->InputAt(0);
     }
 
     if (right->opcode() == IrOpcode::kTruncateInt64ToInt32 &&
-        selector->CanCover(node, right) &&
-        selector->CanCover(right, right->InputAt(0))) {
+        selector->CanCover(node, right)) {
       right = right->InputAt(0);
     }
   }