[wasm][liftoff] Fix stack move width for full pointers

R=jkummerow@chromium.org

Bug: chromium:1307946
Change-Id: I5827f6ce3e854b440c027f8f4862f5a43b088e01
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3553111Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79647}

src/wasm/baseline/x64/liftoff-assembler-x64.h

@@ -872,7 +872,12 @@ void LiftoffAssembler::MoveStackValue(uint32_t dst_offset, uint32_t src_offset,
   DCHECK_NE(dst_offset, src_offset);
   Operand dst = liftoff::GetStackSlot(dst_offset);
   Operand src = liftoff::GetStackSlot(src_offset);
-  switch (element_size_log2(kind)) {
+  size_t size = element_size_log2(kind);
+  if (kind == kRef || kind == kOptRef || kind == kRtt) {
+    // Pointers are uncompressed on the stack!
+    size = kSystemPointerSizeLog2;
+  }
+  switch (size) {
     case 2:
       movl(kScratchRegister, src);
       movl(dst, kScratchRegister);