Core: Process stepping on other platforms.

This includes Android.

Core/System.cpp

@@ -430,10 +430,24 @@ void PSP_EndHostFrame() {
 	}
 }
 
+void PSP_RunLoopWhileState() {
+	// We just run the CPU until we get to vblank. This will quickly sync up pretty nicely.
+	// The actual number of cycles doesn't matter so much here as we will break due to CORE_NEXTFRAME, most of the time hopefully...
+	int blockTicks = usToCycles(1000000 / 10);
+
+	// Run until CORE_NEXTFRAME
+	while (coreState == CORE_RUNNING || coreState == CORE_STEPPING) {
+		PSP_RunLoopFor(blockTicks);
+	}
+}
+
 void PSP_RunLoopUntil(u64 globalticks) {
 	SaveState::Process();
 	if (coreState == CORE_POWERDOWN || coreState == CORE_ERROR) {
 		return;
+	} else if (coreState == CORE_STEPPING) {
+		Core_ProcessStepping();
+		return;
 	}
 
 	mipsr4k.RunLoopUntil(globalticks);