Kernel: Optimize sse saving/loading

Only save and load sse when new thread is trying to execute sse
instruction. There is no need to do that every time we enter kernel.

kernel/kernel/Syscall.cpp

@@ -26,10 +26,6 @@ namespace Kernel
 		Thread::current().set_return_rsp(interrupt_stack.rsp);
 		Thread::current().set_return_rip(interrupt_stack.rip);
 
-#if __enable_sse
-		Thread::current().save_sse();
-#endif
-
 		asm volatile("sti");
 
 		(void)arg1;
@@ -230,10 +226,6 @@ namespace Kernel
 
 		ASSERT(Kernel::Thread::current().state() == Kernel::Thread::State::Executing);
 
-#if __enable_sse
-		current_thread.load_sse();
-#endif
-
 		if (ret.is_error())
 			return -ret.error().get_error_code();
 		return ret.value();