Revert "[OpenTelemetry] Metrics - beter handling for double.NaN (#7072)"

This reverts commit a1b6e6a.

Author: Kielek

src/OpenTelemetry/Internal/InterlockedHelper.cs

@@ -16,7 +16,7 @@ public static void Add(ref double location, double value)
         var currentValue = Volatile.Read(ref location);
 
         var returnedValue = Interlocked.CompareExchange(ref location, currentValue + value, currentValue);
-        if (!AreSame(returnedValue, currentValue))
+        if (returnedValue != currentValue)
         {
             AddRare(ref location, value, returnedValue);
         }
@@ -35,16 +35,12 @@ private static void AddRare(ref double location, double value, double currentVal
             sw.SpinOnce();
 
             var returnedValue = Interlocked.CompareExchange(ref location, currentValue + value, currentValue);
-            if (AreSame(returnedValue, currentValue))
+            if (returnedValue == currentValue)
             {
                 break;
             }
 
             currentValue = returnedValue;
         }
     }
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    private static bool AreSame(double left, double right)
-        => BitConverter.DoubleToInt64Bits(left) == BitConverter.DoubleToInt64Bits(right);
 }