s390x: implement LoadTaggedSignedField

Change-Id: I04813fbb55b60d60a829dbb8970637a7cd32c813
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3437407Reviewed-by: Milad Farazmand <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#78930}

src/codegen/s390/macro-assembler-s390.cc

@@ -891,6 +891,16 @@ void TurboAssembler::DecompressAnyTagged(Register destination,
   agr(destination, kRootRegister);
   RecordComment("]");
 }
+
+void TurboAssembler::LoadTaggedSignedField(Register destination,
+                                           MemOperand field_operand) {
+  if (COMPRESS_POINTERS_BOOL) {
+    DecompressTaggedSigned(destination, field_operand);
+  } else {
+    LoadU64(destination, field_operand);
+  }
+}
+
 void MacroAssembler::RecordWriteField(Register object, int offset,
                                       Register value, Register slot_address,
                                       LinkRegisterStatus lr_status,

src/codegen/s390/macro-assembler-s390.h

@@ -1328,6 +1328,7 @@ class V8_EXPORT_PRIVATE TurboAssembler : public TurboAssemblerBase {
   void LoadTaggedPointerField(const Register& destination,
                               const MemOperand& field_operand,
                               const Register& scratch = no_reg);
+  void LoadTaggedSignedField(Register destination, MemOperand field_operand);
 
   // Loads a field containing any tagged value and decompresses it if necessary.
   void LoadAnyTaggedField(const Register& destination,