Timer: Use pause intrinsics when spin-sleeping

Hopefully reduce power a tiny amount?

src/common/timer.cpp

@@ -1,8 +1,10 @@
-// SPDX-FileCopyrightText: 2019-2024 Connor McLaughlin <stenzek@gmail.com>
+// SPDX-FileCopyrightText: 2019-2026 Connor McLaughlin <stenzek@gmail.com>
 // SPDX-License-Identifier: CC-BY-NC-ND-4.0
 
 #include "timer.h"
+#include "intrin.h"
 #include "types.h"
+
 #include <cstdio>
 #include <cstdlib>
 
@@ -117,13 +119,17 @@ void Timer::SleepUntil(Value value, bool exact)
     const Value wake_at = value - ConvertMillisecondsToValue(0.5);
     Value current = GetCurrentValue();
     if (wake_at > current)
+    {
       SleepUntil(wake_at, false);
+      current = GetCurrentValue();
+    }
 
     // And spin off whatever time is left.
-    do
+    while (current < value)
     {
+      MultiPause();
       current = GetCurrentValue();
-    } while (current < value);
+    }
   }
   else
   {
@@ -205,13 +211,17 @@ void Timer::SleepUntil(Value value, bool exact)
     const Value wake_at = value - min_sleep_time;
     Value current = GetCurrentValue();
     if (wake_at > current)
+    {
       SleepUntil(wake_at, false);
+      current = GetCurrentValue();
+    }
 
     // And spin off whatever time is left.
-    do
+    while (current < value)
     {
+      MultiPause();
       current = GetCurrentValue();
-    } while (current < value);
+    }
   }
   else
   {