Fix up liveness information in update_equiv_regs

[Bernd Schmidt]

I noticed this problem while working on a patch that tries to initialize 
all variables, as suggested by Jim a while ago.  update_equiv_regs can 
eliminate all references to a pseudo, but leave its bit set in some 
global_live_at_start arrays.  Currently this seems to be undetected, but 
it caused aborts while building libgcc when I added my code.

Bootstrapped & tested (minus Ada) on i686-linux; committed.


Bernd
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