[vector] Fix compiler errors

[Paul Sandoz]

Fix some compiler errors (warnings as errors) for some logical expressions:

  http://cr.openjdk.java.net/~psandoz/panama/vector-hs-errors/webrev/ <http://cr.openjdk.java.net/~psandoz/panama/vector-hs-errors/webrev/>


Separately when running all the tests I observed this single failure on by Mac book:

test Short64VectorTests.MINShort64VectorTests(short[i * 5]): failure
java.lang.IndexOutOfBoundsException: Index 1560 out of bounds for length 1557
        at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
        at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
        at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248)
        at java.base/java.util.Objects.checkIndex(Objects.java:373)
        at jdk.incubator.vector/jdk.incubator.vector.VectorIntrinsics.checkFromIndexSize(VectorIntrinsics.java:496)
        at jdk.incubator.vector/jdk.incubator.vector.ShortVector.fromArray(ShortVector.java:2799)
        at Short64VectorTests.MINShort64VectorTests(Short64VectorTests.java:2171)
I have not yet looked more closely as to the cause, but it is a curious one since over tests pass, such as MAXShort64VectorTests(short[i * 5]).

Paul.