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This version incorporates suggestions from Bernd.  Basically we have
reload1.c set reload_completed internally rather than deferring it into
ira.c.  That allows the call to reload() to return whether or not a DCE
pass is desirable at the end of reload.

That in turn allows us to avoid the DF clumsiness of the previous version.

Bootstrapped and regression tested on x86_64-unknown-linux-gnu.

Bernd is still seeing some differences on mips64-linux; I've been unable
to reproduce those.  Bernd, if you can send me the dump files privately,
I'm more than happy to take a look at any remaining codegen differences
this patch is triggering.

Thanks,
Jeff
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