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Use zrot for applying Givens rotation #28

@kevinsung

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@kevinsung

One of these calls to zscal can be eliminated by either merging with the one in the next loop or by redefining the Givens rotation so that it only requires one phasing operation:

zscal(dim_b, phase_conj, row_i, 1);
zdrot(dim_b, row_i, 1, row_j, 1, c, s);
zscal(dim_b, phase, row_i, 1);

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needs upstream changeRequires a change in an upstream libraryperformancePerformance improvementrustInvolves writing Rust

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