[x64] Remove dead code related to safepoint registers

Change-Id: I33999e33793662aad741d336018f3a099af17fec
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2728239
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Auto-Submit: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73114}

src/codegen/x64/macro-assembler-x64.cc

@@ -2838,12 +2838,6 @@ void TurboAssembler::Popcntq(Register dst, Operand src) {
   UNREACHABLE();
 }
 
-// Order general registers are pushed by Pushad:
-// rax, rcx, rdx, rbx, rsi, rdi, r8, r9, r11, r14, r15.
-const int
-    MacroAssembler::kSafepointPushRegisterIndices[Register::kNumRegisters] = {
-        0, 1, 2, 3, -1, -1, 4, 5, 6, 7, -1, 8, 9, -1, 10, 11};
-
 void MacroAssembler::PushStackHandler() {
   // Adjust this code if not the case.
   STATIC_ASSERT(StackHandlerConstants::kSize == 2 * kSystemPointerSize);

src/codegen/x64/macro-assembler-x64.h

@@ -1140,19 +1140,7 @@ class V8_EXPORT_PRIVATE MacroAssembler : public TurboAssembler {
   // In-place weak references.
   void LoadWeakValue(Register in_out, Label* target_if_cleared);
 
-  // ---------------------------------------------------------------------------
-  // Debugging
-
-  static int SafepointRegisterStackIndex(Register reg) {
-    return SafepointRegisterStackIndex(reg.code());
-  }
-
  private:
-  // Order general registers are pushed by Pushad.
-  // rax, rcx, rdx, rbx, rsi, rdi, r8, r9, r11, r12, r14, r15.
-  static const int kSafepointPushRegisterIndices[Register::kNumRegisters];
-  static const int kNumSafepointSavedRegisters = 12;
-
   // Helper functions for generating invokes.
   void InvokePrologue(Register expected_parameter_count,
                       Register actual_parameter_count, Label* done,
@@ -1166,15 +1154,6 @@ class V8_EXPORT_PRIVATE MacroAssembler : public TurboAssembler {
 
   void LeaveExitFrameEpilogue();
 
-  // Compute memory operands for safepoint stack slots.
-  static int SafepointRegisterStackIndex(int reg_code) {
-    return kNumSafepointRegisters - kSafepointPushRegisterIndices[reg_code] - 1;
-  }
-
-  // Needs access to SafepointRegisterStackIndex for compiled frame
-  // traversal.
-  friend class CommonFrame;
-
   DISALLOW_IMPLICIT_CONSTRUCTORS(MacroAssembler);
 };