std: rework math.scalbn (#8733)

* std: fix overflow in math.scalbn32

* std: rewrite math.scalbn to be generic

* std: support f128 in math.isNormal

* std: enable f128 tests in math.scalbn
612ad779bbviri committed on 5/14/2021, 8:15:53 PM· committed by GitHubparent114c661
2 files changedLine totals unavailable