kernel/thread: Remove global GetCurrentThread()

This is only used in one place, so we can fold it into the calling code,
eliminating a place for the global system instance to be used.

src/core/hle/kernel/handle_table.cpp

@@ -8,6 +8,7 @@
 #include "core/core.h"
 #include "core/hle/kernel/errors.h"
 #include "core/hle/kernel/handle_table.h"
+#include "core/hle/kernel/scheduler.h"
 #include "core/hle/kernel/process.h"
 #include "core/hle/kernel/thread.h"
 
@@ -103,7 +104,7 @@ bool HandleTable::IsValid(Handle handle) const {
 
 std::shared_ptr<Object> HandleTable::GetGeneric(Handle handle) const {
     if (handle == CurrentThread) {
-        return SharedFrom(GetCurrentThread());
+        return SharedFrom(Core::System::GetInstance().CurrentScheduler().GetCurrentThread());
     } else if (handle == CurrentProcess) {
         return SharedFrom(Core::System::GetInstance().CurrentProcess());
     }

src/core/hle/kernel/thread.cpp

@@ -13,16 +13,8 @@
 #include "common/logging/log.h"
 #include "common/thread_queue_list.h"
 #include "core/arm/arm_interface.h"
-#ifdef ARCHITECTURE_x86_64
-#include "core/arm/dynarmic/arm_dynarmic_32.h"
-#include "core/arm/dynarmic/arm_dynarmic_64.h"
-#endif
-#include "core/arm/cpu_interrupt_handler.h"
-#include "core/arm/exclusive_monitor.h"
 #include "core/arm/unicorn/arm_unicorn.h"
 #include "core/core.h"
-#include "core/core_timing.h"
-#include "core/core_timing_util.h"
 #include "core/cpu_manager.h"
 #include "core/hardware_properties.h"
 #include "core/hle/kernel/errors.h"
@@ -36,6 +28,11 @@
 #include "core/hle/result.h"
 #include "core/memory.h"
 
+#ifdef ARCHITECTURE_x86_64
+#include "core/arm/dynarmic/arm_dynarmic_32.h"
+#include "core/arm/dynarmic/arm_dynarmic_64.h"
+#endif
+
 namespace Kernel {
 
 bool Thread::ShouldWait(const Thread* thread) const {
@@ -540,13 +537,4 @@ ResultCode Thread::SetCoreAndAffinityMask(s32 new_core, u64 new_affinity_mask) {
     return RESULT_SUCCESS;
 }
 
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-/**
- * Gets the current thread
- */
-Thread* GetCurrentThread() {
-    return Core::System::GetInstance().CurrentScheduler().GetCurrentThread();
-}
-
 } // namespace Kernel

src/core/hle/kernel/thread.h

@@ -680,9 +680,4 @@ private:
     std::string name;
 };
 
-/**
- * Gets the current thread
- */
-Thread* GetCurrentThread();
-
 } // namespace Kernel