SWEEP: Reviewed all applications of .AddAndGet() methods from atomic …

…numeric classes

src/Lucene.Net/Store/RAMFile.cs

@@ -90,7 +90,7 @@ protected internal byte[] AddBuffer(int size)
                 UninterruptableMonitor.Exit(this);
             }
 
-            directory?.m_sizeInBytes.AddAndGet(size);
+            directory?.m_sizeInBytes.GetAndAdd(size);
             return buffer;
         }
 
@@ -146,4 +146,4 @@ public virtual long GetSizeInBytes()
             }
         }
     }
-}
+}