Inappropriate output of \ufffd in various decoders

This bug is closed as it is fixed along with the 6949920.
And this is the part of the regression of the 6949920 bug.

http://jpsesvr.sfbay.sun.com:8080/ctetools/html/ViewDetail.jsp?index=3423
I need to re-open this CR.
While is is associated with 6949920, it is not a duplicate.

6949920 was fixed by backout of the previous errant fix. The backout did not address the core issue.

This CR 6392804, is now a multiple with 6233838
as described at.
  https://jetsvr.sfbay.sun.com:8443/BugApproval/ViewDetail.jsp?index=8878

Note that the other Multiple CRs listed:
  6949920 : ISO-2022-JP Decoder error
  6959851 : sun/nio
are already FDE (by backout). I agree they should be referenced somewhere in this RTI, but not in the "Multiple CRs "section.