Fix gl::floatToNormalized for negative inputs Bug: angleproject:352963106 Change-Id: If353ff4126c6203ef6c1267d2b5c85b927964f15 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5710508 Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com> Reviewed-by: Kenneth Russell <kbr@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>