Kernel: store/load sse/mmx/fpu state on isr/irq/syscall

I haven't tested this yet but should be fine. This will be optimized
to only save state from threads that are using it

kernel/kernel/Syscall.cpp

@@ -30,6 +30,8 @@ namespace Kernel
 			return 0;
 		}
 
+		Thread::current().save_sse();
+
 		asm volatile("sti");
 
 		(void)arg1;
@@ -183,6 +185,8 @@ namespace Kernel
 			break;
 		}
 
+		Thread::current().load_sse();
+
 		if (ret.is_error())
 			return -ret.error().get_error_code();
 		return ret.value();