bqsr: Fix VCF range computation
bqsr: Fix VCF range computation

Change-Id: I2c0846ddcd9a2ad26f9edd01eabe0ff37fcbb45f

[git-p4: depot-paths = "//sw/gpgpu/nvbio/bqsr/": change = 18886514]

NVlabs/firepony,broadinstitute/firepony,NVlabs/firepony,NVlabs/firepony,broadinstitute/firepony,broadinstitute/firepony,NVlabs/firepony,broadinstitute/firepony