cherry-pick from 7241: speed-up matrix44::setconcat when both inputs are
scale+translate by inlining the zero-assignments, rather than calling sk_bzero.

bench: matrix44_setconcat 2x faster



git-svn-id: http://skia.googlecode.com/svn/trunk@7251 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed