Merge pull request #1043 from Subv/timing

Use an approximated amortized amount of ticks when advancing timing.

src/core/core_cpu.cpp

@@ -91,6 +91,7 @@ void Cpu::RunLoop(bool tight_loop) {
         LOG_TRACE(Core, "Core-{} idling", core_index);
 
         if (IsMainCore()) {
+            // TODO(Subv): Only let CoreTiming idle if all 4 cores are idling.
             CoreTiming::Idle();
             CoreTiming::Advance();
         }