Patch to fix local-alloc REG_EQUIV handling

[John Wehle]

>  > 	* local-alloc.c (validate_equiv_mem): Reject memory
>  > 	addresses which vary.
> I'm almost certain this isn't needed.
>
> Why?  Because validate_equiv_mem already checks for anything which
> modifies the MEM's address.  ie, even though the address varies, we
> check explicitly for modifications in the interval we care about.

Don't we have the same reload problem if the MEM's address mentions a
pseudo?  The pseudo might not be live when reload uses the REG_EQUIV.

-- John
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