RFR: 8204967: Resolve disabled warnings for libunpack

[Jim Laskey]

Does -Wimplicit-fallthrough=3 work for gnu c and clang?

unpack.cpp redundant comment

3713     // else fall through:

+1  

— Jim


> On Jun 13, 2018, at 1:57 PM, Srinivas Dama <srinivas.dama at oracle.com> wrote:
> 
> Hi,
> 
> Please review http://cr.openjdk.java.net/~sdama/8204967/webrev.00/
> for https://bugs.openjdk.java.net/browse/JDK-8204967
> 
> Regards,
> Srinivas