// Compilers can use the information that a certain branch is not likely to be
// taken (for instance, a CHECK failure) to optimize for the common case in
// the absence of better information (ie. compiling gcc with `-fprofile-arcs`).
//
// Recommendation: Modern CPUs dynamically predict branch execution paths,
// typically with accuracy greater than 97%. As a result, annotating every
// branch in a codebase is likely counterproductive; however, annotating
// specific branches that are both hot and consistently mispredicted is likely
// to yield performance improvements.
