RFR: 8178048: [JVMCI] improve HotSpotResolvedJavaFieldImpl.hashCode()

[Christian Haeubl]

|Hi,

Please review this small JVMCI change that decreases the probability of 
hashcode collisions.|
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|https://bugs.openjdk.java.net/browse/JDK-8178048|
|http://cr.openjdk.java.net/~chaeubl/8178048/webrev.001/|
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|- Christian

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