V_FLAG backend type has a float/ordered modifier
Check parity flag for nan-comparisons
v_inv_cmp takes a flag-struct
impl_jcond can handle inverted cmps
Redirect impl_jcond() logic through itself
Added float check in impl_jcond
Added a basic __builtin_nanf()
Partial fix for converting a reg-save to float
Align stack to 16-bytes for calls (SSE insns)
x86_64 nan cmp parity flag-bit checks for !=/==
Take float/nan-parity into account for jumps-via-flags
nan test files + current cmp example