RFR(S): 8210319: [s390]: Use of shift operators not covered by cpp standard

[Schmidt, Lutz]

Dear All,

may I please request reviews for this small, s390-only patch. It fixes some shift operations which relied on behavior not covered by the language standard.
Bug:    https://bugs.openjdk.java.net/browse/JDK-8210319
Webrev: http://cr.openjdk.java.net/~lucy/webrevs/8210319.00/

Thank you!
Lutz

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