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* Fix vectorized version of bli_amaxv To match Netlib, i?amax should return: - the lowest index among equal values - the first NaN if one is encountered * Fix typos. * And another one... * Update ref. amaxv kernel too. * Re-enabled optimized amaxv kernels. Details: - Re-enabled the optimized, intrinsics-based amaxv kernels in the 'zen' kernel set for use in haswell, zen, zen2, knl, and skx subconfigs. These two kernels (for s and d datatypes) were temporarily disabled ine186d71as part of issue #380. However, the key missing semantic properties that prompted the disabling of these kernels--returning the index of the *first* rather than of the last element with largest absolute value, and returning the index of the first NaN if one is encountered--were added as part of #382 thanks to Devin Matthews. Thus, now that the kernels are working as expected once more, this commit causes these kernels to once again be registered for the affected subconfigs, which effectively reverts all code changes included ine186d71. - Whitespace/formatting updates to new macros in bli_amaxv_zen_int.c. Co-authored-by: Field G. Van Zee <field@cs.utexas.edu>