Display: Resched interrupt before vblank threads.

Otherwise, we may first schedule to a woken thread, and then immediately
reschedule to the interrupt.  Each reschedule costs ticks, and it doesn't
look like this should cause two reschedules.

Improves #11414, Breath of Fire 3 frame flicker.

Core/HLE/sceDisplay.cpp

@@ -645,6 +645,9 @@ void hleEnterVblank(u64 userdata, int cyclesLate) {
 
 	CoreTiming::ScheduleEvent(msToCycles(vblankMs) - cyclesLate, leaveVblankEvent, vbCount + 1);
 
+	// Trigger VBlank interrupt handlers.
+	__TriggerInterrupt(PSP_INTR_IMMEDIATE | PSP_INTR_ONLY_IF_ENABLED | PSP_INTR_ALWAYS_RESCHED, PSP_VBLANK_INTR, PSP_INTR_SUB_ALL);
+
 	// Wake up threads waiting for VBlank
 	u32 error;
 	bool wokeThreads = false;
@@ -663,9 +666,6 @@ void hleEnterVblank(u64 userdata, int cyclesLate) {
 		__KernelReSchedule("entered vblank");
 	}
 
-	// Trigger VBlank interrupt handlers.
-	__TriggerInterrupt(PSP_INTR_IMMEDIATE | PSP_INTR_ONLY_IF_ENABLED | PSP_INTR_ALWAYS_RESCHED, PSP_VBLANK_INTR, PSP_INTR_SUB_ALL);
-
 	numVBlanks++;
 	numVBlanksSinceFlip++;