regrename creates invalid insn

[Bernd Schmidt]

On 03/26/2012 06:03 PM, Andreas Schwab wrote:
> Bernd Schmidt <bernds@codesourcery.com> writes:
> 
>> Does 4.7 still have the failure at all?
> 
> Yes, see PR52573.

Well, I still think having both REG_DEAD and REG_UNUSED for the same reg
is bogus, but fixing that causes trouble in reg-stack. It seems the path
of least resistance is to just cope with the situation in regrename.

The following seems to cure the problem with a 4.7 m68k cross. Also
bootstrapped and tested with -frename-registers enabled at -O2 on
x86_64-linux. Ok everywhere?


Bernd
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