julia

7cb9cda0 - Work around issue with truncated Float32 representation of lwork in

Work around issue with truncated Float32 representation of lwork in sgesdd by using nextfloat. Now with comments and test so this commit supersedes ad59ceb6398114b6ee49756ed14f493d9d28485c See http://icl.cs.utk.edu/lapack-forum/viewtopic.php?f=13&t=4587&p=11036&hilit=sgesdd#p11036 and scipy/scipy#5401 Fixes #15784 (cherry picked from commit b6988df6959a00c879a5a090310d8f3d5c6d9e11) ref #15824