Java: FP in java/integer-multiplication-cast-to-long when using Long.BYTES

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See: https://discuss.lgtm.com/t/java-false-positives/1787/2

Example: https://lgtm.com/projects/g/apache/accumulo/snapshot/dist-1984940991-1551192209962/files/core/src/main/java/org/apache/accumulo/core/file/rfile/bcfile/BCFile.java?sort=name&dir=ASC&mode=heatmap#xc3783b1655fd55ea:1

Final fields that are well-known, and for which we don't have the source code (e.g. Long.BYTES) are not considered ConstantIntegerExpr in RangeUtils.qll, so we incorrectly flag some multiplications as potential overflows.