[bug] fix IVFPQFastScan::RangeSearch() on ARM

[alexanderguzhva]

A non-trivial bug in the FAISS code. Check facebookresearch/faiss#4247

the problem happens if radius - normalizers[2 * q + 1] is negative. Thus, it is possible to provide reasonable parameters to IVFPQFastScan::RangeSearch() and get an empty result.

issue: #1100

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[alexanderguzhva]

/kind bug

[alexanderguzhva]

issue: #1100

[alexanderguzhva]

/kind improvement

[liliu-z]

/lgtm

[liliu-z]

/approve