[8u60] Request for approval for 8075520: Varargs access check mishandles capture variables

[Dan Smith]

Please approve this langtools bug fix.  Patch applies cleanly to jdk8u (after renaming paths).

Bug report: https://bugs.openjdk.java.net/browse/JDK-8075520
Also fixes: https://bugs.openjdk.java.net/browse/JDK-8077786
Changeset: http://hg.openjdk.java.net/jdk9/dev/langtools/rev/5cd4dba2e742
jdk9 reviewer: vromero

—Dan