RFR 8150388: Remove SPARC 32-bit support

[George Triantafillou]

(Adding compiler).

Please review this fix to remove SPARC 32-bit support.  Support for 
solaris-sparc has been dropped from the list of supported platforms.

JBS: https://bugs.openjdk.java.net/browse/JDK-8150388
webrev: http://cr.openjdk.java.net/~gtriantafill/8150388-webrev/webrev/ 
<http://cr.openjdk.java.net/%7Egtriantafill/8150388-webrev/webrev/>

Built and tested on solaris-sparcv9-debug,solaris-x64-debug with the 
nsk.jvmti, nsk.jdwp, and nsk.jdi testlists.

Thanks.

-George

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