fixed computation of SEQUENCE_SYMBOLS_PER_WORD
fixed computation of SEQUENCE_SYMBOLS_PER_WORD

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18499201]

kimrutherford/nvbio,kimrutherford/nvbio,NVlabs/nvbio,NVlabs/nvbio,NVlabs/nvbio,kimrutherford/nvbio,kimrutherford/nvbio,NVlabs/nvbio