remove SkFP.h and replace SkFP with SkScalar stop respecting SK_SOFTWARE_FLOAT, assume its always false stop respecting SK_SCALAR_SLOW_COMPARES, assume its always false

BUG=
R=caryclark@google.com

Review URL: https://codereview.chromium.org/116183002

git-svn-id: http://skia.googlecode.com/svn/trunk@12686 2bbb7eff-a529-9590-31e7-b0007b416f81
7 files changed