RFR: JDK-8199782: Fix compilation warnings detected by Solaris Developer Studio 12.6

[Magnus Ihse Bursie]

On 2018-04-04 20:18, Gary Adams wrote:
> Getting the sources ready for the next Solaris developer studio 
> toolchain.
>
>   Issue: https://bugs.openjdk.java.net/browse/JDK-8199782
>   Webrev: http://cr.openjdk.java.net/~gadams/8199782/webrev.00/
>
> This update conditionally disables some new error checks, if the
> new toolchain is used.

Looks good to me.

/Magnus