Re: Fix PR 20100, PR 20115. Remove pass_maybe_create_global_var.

[Andrew Pinski <pinskia at physics dot uc dot edu>]

On Feb 23, 2005, at 12:03 AM, Diego Novillo wrote:
> I also noticed that in some situations we were creating
> .GLOBAL_VAR unnecessarily.  The problem is that once we create
> .GLOBAL_VAR, we are stuck with it (this is a limitation that we
> should remove, but removing symbols from referenced_vars may be
> too intrusive for 4.0).
>
> We were creating .GLOBAL_VAR before comptuing aliases to avoid
> the initial SSA creation to deal with too many virtual operands.
> So, we do an IL scan, and if we find a lot of function calls, we
> would create .GLOBAL_VAR.  A better solution is to just not
> bother adding virtual operands at call sites if aliases have not
> been computed.  This gives us a minor speedup in operand
> scanning and SSA rewriting.

Note that pass_maybe_create_global_var was added to speed up
the compiler. See PR 15855.  I think you just slowed down this
testcase again.

-- Pinski