hg: shenandoah/jdk10: Check BS type in immByteMapBase predicate

[roman at kennke.org]

Changeset: 8954a7894ec1
Author:    rkennke
Date:      2017-12-05 12:37 +0000
URL:       http://hg.openjdk.java.net/shenandoah/jdk10/rev/8954a7894ec1

Check BS type in immByteMapBase predicate

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