Faster compilation speed

[Joe Buck]

Robert Dewar writes:
> But remember that work you put in on speeding up the compiler is work
> that you do not put in on improving the compiler. As time goes on, quality
> of generated code continues to be critical, compiler speed is less critical.

Um, possibly you forget that in order to get a change accepted, the
contributor has to do a three-stage bootstrap with the compiler and run
the regressions.  If that process ran three times faster, contributors
could try three times as many versions of possible patches in the same
time period.

Given this, making gcc build itself and run the regressions faster would
lead to faster improvement in the compiler.