[8u] RFR for JDK-8180660: missing LNT entry for finally block

[Shafi Ahmad]

Hi,
 
Please review the backport of bug: "JDK-8180660: missing LNT entry for finally block" to jdk8u-dev

Please note that this is not a clean backport due to - 
A) Compilation failure for file share/classes/com/sun/tools/javac/tree/TreeInfo.java.
     To make it compile we have made a code change in 'enum PosKind'. 
     Thanks to Maurizio and Vicente for the help.  
B) Compilation failure in file test/tools/javac/T8180660/MissingLNTEntryForFinalizerTest.java due to Module related code.
    +        void clear() {
    +            newRound();
    +            Modules.instance(context).newRound();
    +        }
I have modified the above method to
    +        void clear() {
    +            //do nothing
    +        }  
... and also removed all module related change.

Webrev: http://cr.openjdk.java.net/~shshahma/8180660/webrev.00/
Jdk10 bug: https://bugs.openjdk.java.net/browse/JDK-8180660
Original patch pushed to jdk10: http://hg.openjdk.java.net/jdk10/jdk10/langtools/rev/f52e81f886fb

Test:  Run jprt, all langtools jtreg test, jtreg test under  jdk/test/java/util and jdk/test/java/lang and newly added test case.

Regards,
Shafi