Solaris Studio has recently be renamed Oracle Developer Studio. The JDK configure scripts should accept this as a supported toolchain, as it is essentially just a new release of Solaris Studio. Currently configure fails with:

configure: The C compiler (located as /opt/developerstudio12.5/bin/cc) does not seem to be the required solstudio compiler.
configure: The result from running with -V was: "cc: Studio 12.5 Sun C 5.14 SunOS_sparc 2016/05/31"
configure: The result from running with --version was: "cc: Warning: Option --version passed to ld, if ld is invoked, ignored otherwise