GCUtil: allocate memory in even more humble chunks

platform/util/src/com/intellij/util/ref/GCUtil.java

@@ -60,7 +60,7 @@ public class GCUtil {
       }
 
       // full gc is caused by allocation of large enough array below, SoftReference will be cleared after two full gc
-      int bytes = Math.min((int)(freeMemory * 0.1), Integer.MAX_VALUE / 2);
+      int bytes = Math.min((int)(freeMemory * 0.05), Integer.MAX_VALUE / 2);
       list.add(new SoftReference<Object>(new byte[bytes]));
     }