Bug ID: JDK-8043186 javac test langtools/tools/javac/util/StringUtilsTest.java fails

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JDK 8	JDK 9
8u20Fixed	9 b15Fixed

The langtools/tools/javac/util/StringUtilsTest.java test fails with:
java.lang.IllegalStateException: expected=2; actual=4
	at StringUtilsTest.assertEquals(StringUtilsTest.java:63)
	at StringUtilsTest.run(StringUtilsTest.java:52)
	at StringUtilsTest.main(StringUtilsTest.java:37)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:484)
	at com.sun.javatest.regtest.MainAction$SameVMRunnable.run(MainAction.java:759)
	at java.lang.Thread.run(Thread.java:745)

Appears to be related to JDK-8041791:
http://hg.openjdk.java.net/jdk9/dev/jdk/rev/6d8b6c20a32b

This is not only related to a test, javadoc output may be affected in some (possibly rare) cases (as javadoc expects that the index returned by .toLowerCase().indexOf() is applicable to the original string, which is not generally the case after JDK-8041791).

Relates :	JDK-8030623 - Remove unused com.sun.tools.doclets.formats.html.MethodWriterImpl.parseCodeTag method
Relates :	JDK-8029800 - Flags.java uses String.toLowerCase without specifying Locale
Relates :	JDK-8041791 - String.toLowerCase regression - violates Unicode standard