s390x: [liftoff] fix endianness issue on MoveStackValue

Change-Id: I7dfe3005554286f2f6a83acc4019c3cf06f7f65c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2774058Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#73545}

src/wasm/baseline/s390/liftoff-assembler-s390.h

@@ -593,6 +593,12 @@ void LiftoffAssembler::LoadReturnStackSlot(LiftoffRegister dst, int offset,
   }
 }
 
+#ifdef V8_TARGET_BIG_ENDIAN
+constexpr int stack_bias = -4;
+#else
+constexpr int stack_bias = 0;
+#endif
+
 void LiftoffAssembler::MoveStackValue(uint32_t dst_offset, uint32_t src_offset,
                                       ValueKind kind) {
   DCHECK_NE(dst_offset, src_offset);
@@ -616,6 +622,9 @@ void LiftoffAssembler::MoveStackValue(uint32_t dst_offset, uint32_t src_offset,
       UNREACHABLE();
   }
 
+  dst_offset += (length == 4 ? stack_bias : 0);
+  src_offset += (length == 4 ? stack_bias : 0);
+
   if (is_int20(dst_offset)) {
     lay(ip, liftoff::GetStackSlot(dst_offset));
   } else {
@@ -650,12 +659,6 @@ void LiftoffAssembler::Move(DoubleRegister dst, DoubleRegister src,
   }
 }
 
-#ifdef V8_TARGET_BIG_ENDIAN
-constexpr int stack_bias = -4;
-#else
-constexpr int stack_bias = 0;
-#endif
-
 void LiftoffAssembler::Spill(int offset, LiftoffRegister reg, ValueKind kind) {
   DCHECK_LT(0, offset);
   RecordUsedSpillOffset(offset);