New size optimization

[Jeffrey A Law]

  In message < 199804010031.QAA06136@rtl.cygnus.com >you write:
  > I was talking to Anthony Green about this, and he mentioned that
  > it might be useful to add a flag to disable loop-invariant-code-motion and then have -Os
  > set that flag.
Not a bad idea.

Then again, as you mention, we could end up with too man -f flags.  Some
might even say we already have too many -f flags :-)

I've got no strong opinion either way, I'll go with any decision folks
want.

jeff