[8u] RFR (XS) 8260484: CheckExamples.java / NoJavaLangTest.java fail with jtreg 4.2

[Aleksey Shipilev]

Original bug:
   https://bugs.openjdk.java.net/browse/JDK-8260484

There is no changeset available for it, Oracle-private fix. But, the report mentions it is fixed in 
JDK 9+, and I have successfully adapted these two fixes from JDK 9+:
   https://hg.openjdk.java.net/jdk9/jdk9/langtools/rev/4012b3f11f0d#l20.1

8u webrev:
   https://cr.openjdk.java.net/~shade/8260484/webrev.8u.01/

Testing: langtools_tier1 (tests are now passing, except the remaining 8u regression: JDK-8265527)

-- 
Thanks,
-Aleksey