SparseLU: fix estimated non-zeros in U
(transplanted from daa3ecbd81fbf957dfe2bcda1c35b44dcee85ca1)

--HG--
branch : 3.2
extra : transplant_source : %DA%A3%EC%BD%81%FB%F9W%DF%E2%BC%DA%1C5%B4M%CE%E8%5C%A1
JacobiSVD: fix a 0/0 issue for complexes
(transplanted from 34afe8ecac2e178f75ade9092e9ef2f693607d4d)

--HG--
branch : 3.2
extra : transplant_source : 4%AF%E8%EC%AC.%17%8Fu%AD%E9%09.%9E%F2%F6%93%60%7DM