RFR JDK-8042125: Japanese character converters incompatible between Java 7 and Java 8

[Xueming Shen]

Hi

Please help the change for 8042125
issue: https://bugs.openjdk.java.net/browse/JDK-8042125
webrev: http://cr.openjdk.java.net/~sherman/8042125

It's a regression caused by the changes of JDK-6653797. The direct 
triggers are
(1) the .c2b mapping table for ms932/0208is missing (regardless the 
comment in
     JIS_X_0208_MS932.map says we need one)
(2) mapping entry for those non-roundtrip code points are mistakenly 
commented
    out in jis_x_0212_solaris.map and jis_x_0208_ms932.map.

thanks!
-Sherman