Enters a named block. There should always be a matching invocation of
     * {@link #leave(String)} when leaving the block. Calls to this method will
     * be removed by the compiler unless profiling is enabled.
Enters a named block. There should always be a matching invocation of
     * {@link #leave(String)} when leaving the block. Calls to this method will
     * be removed by the compiler unless profiling is enabled. | Profiler.java