Back in 2011, in order to prevent repeated warnings about bootclasspath not being set (JDK-7022337), code was added to JavaCompiler.java to forcibly set the `-Xlint:-options` flag after compiler startup:

        // forcibly set the equivalent of -Xlint:-options, so that no further
        // warnings about command line options are generated from this point on
        options.put(XLINT_CUSTOM.primaryName + "-" + LintCategory.OPTIONS.option, "true");
        options.remove(XLINT_CUSTOM.primaryName + LintCategory.OPTIONS.option);

This workaround complicates logic relating to warnings in the `"options"` category and, due to improvements to the compiler design since then, it's no longer needed to actually fix the problem. So it can be removed.

As a separate cleanup, the field "optionsCheckingInitiallyDisabled" in JavaCompiler.java is no longer used and so it can also be removed.