CPU: GTE completion cycle should be reset/serialized

Yay more determinism breakage...

src/core/cpu_core.cpp

@@ -221,14 +221,16 @@ void CPU::Reset()
   // This consumes cycles, so do it first.
   SetPC(RESET_VECTOR);
 
-  g_state.pending_ticks = 0;
   g_state.downcount = 0;
+  g_state.pending_ticks = 0;
+  g_state.gte_completion_tick = 0;
 }
 
 bool CPU::DoState(StateWrapper& sw)
 {
   sw.Do(&g_state.pending_ticks);
   sw.Do(&g_state.downcount);
+  sw.DoEx(&g_state.gte_completion_tick, 78, static_cast<u32>(0));
   sw.DoArray(g_state.regs.r, static_cast<u32>(Reg::count));
   sw.Do(&g_state.pc);
   sw.Do(&g_state.npc);

src/core/save_state_version.h

@@ -6,7 +6,7 @@
 #include "common/types.h"
 
 static constexpr u32 SAVE_STATE_MAGIC = 0x43435544;
-static constexpr u32 SAVE_STATE_VERSION = 77;
+static constexpr u32 SAVE_STATE_VERSION = 78;
 static constexpr u32 SAVE_STATE_MINIMUM_VERSION = 42;
 
 static_assert(SAVE_STATE_VERSION >= SAVE_STATE_MINIMUM_VERSION);