Debugger: Avoid ppcState global.

Source/Core/Core/PowerPC/Interpreter/Interpreter.cpp

@@ -342,7 +342,8 @@ void Interpreter::unknown_instruction(UGeckoInstruction inst)
   const u32 opcode = PowerPC::HostRead_U32(last_pc);
   const std::string disasm = Common::GekkoDisassembler::Disassemble(opcode, last_pc);
   NOTICE_LOG_FMT(POWERPC, "Last PC = {:08x} : {}", last_pc, disasm);
-  Dolphin_Debugger::PrintCallstack(Common::Log::LogType::POWERPC, Common::Log::LogLevel::LNOTICE);
+  Dolphin_Debugger::PrintCallstack(Core::System::GetInstance(), Common::Log::LogType::POWERPC,
+                                   Common::Log::LogLevel::LNOTICE);
   NOTICE_LOG_FMT(
       POWERPC,
       "\nIntCPU: Unknown instruction {:08x} at PC = {:08x}  last_PC = {:08x}  LR = {:08x}\n",