One more global.c speedup

[Joern Rennecke]

In article < 11143.942372278@upchuck > you wrote:

: Thus, it is not necessary to mark conflicts between two pseudos just because
: they are live at the same time -- only need to mark the conflict when one is
: live at the point where the other becomes live.  This allows the compiler to
: be more efficient when it builds the conflict matrix.

I think you can make the same argument for hard register - pseudo conflicts.
So record_conflicts can go altogether once the combine_reloads /
find_dummy_reload issues are resolved.