s390x: [baseline] fix load from flagoffset

Change-Id: I08f3ad3987f633de5073c7f44ebb7a71de2425e2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3470564Reviewed-by: Milad Farazmand <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#79147}

src/builtins/s390/builtins-s390.cc

@@ -39,7 +39,7 @@ static void AssertCodeIsBaseline(MacroAssembler* masm, Register code,
                                  Register scratch) {
   DCHECK(!AreAliased(code, scratch));
   // Verify that the code kind is baseline code via the CodeKind.
-  __ LoadU64(scratch, FieldMemOperand(code, Code::kFlagsOffset));
+  __ LoadU32(scratch, FieldMemOperand(code, Code::kFlagsOffset));
   __ DecodeField<Code::KindField>(scratch);
   __ CmpS64(scratch, Operand(static_cast<int>(CodeKind::BASELINE)));
   __ Assert(eq, AbortReason::kExpectedBaselineData);