RFR (XS) 8224234: compiler/codegen/TestCharVect2.java fails in test_mulc

[Viswanathan, Sandhya]

Please find below a small patch which fixes the issue:
JBS: https://bugs.openjdk.java.net/browse/JDK-8224234
Patch: http://cr.openjdk.java.net/~sviswanathan/8224234/

Multiplication is implemented as shift, add sequence in certain cases.
The problem was occurring because the "shift by" register was being overwritten due to missing effect statement in the shift rules.
The problem was introduced as part of https://bugs.openjdk.java.net/browse/JDK-8222074.
The patch adds the missing effect statements.

Best Regards,
Sandhya

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