[x64][codegen] Reduce kX64Shr to kX64Shr32

This allows x64 to select shrl instead of shrq instruction for the
below pattern:

  2: ChangeUint32ToUint64(1)
  3: Int64Constant[2]
  4: Word64Shr(2, 3)

Change-Id: I3278b9ab52dd7212d1a616291d114a6bff0d13d8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3857740Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Hao A Xu <hao.a.xu@intel.com>
Cr-Commit-Position: refs/heads/main@{#82739}

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

@@ -997,6 +997,11 @@ void VisitWord64Shift(InstructionSelector* selector, Node* node,
   Node* right = m.right().node();
 
   if (g.CanBeImmediate(right)) {
+    if (opcode == kX64Shr && m.left().IsChangeUint32ToUint64() &&
+        m.right().HasResolvedValue() && m.right().ResolvedValue() < 32) {
+      opcode = kX64Shr32;
+      left = left->InputAt(0);
+    }
     selector->Emit(opcode, g.DefineSameAsFirst(node), g.UseRegister(left),
                    g.UseImmediate(right));
   } else {