Patch to allow Ada to work with tree-ssa

[Nathan Sidwell]

Richard Kenner wrote:
>     As illustrated by the growth of GCC itself.  My bootstrap plus testsuite
>     run times on constant hardware have gone from under one hour a bit over
>     three years ago to over three hours now (and this is artificially low
>     because of the temporary disabling of Ada).  Much of this is the growth in
>     GCC itself, but a significant part must be GCC slowing down.
> 
> Well, sure, but constant hardware isn't a good model of what's out there.
It is for what users perceive. A user upgrades from GCCn to GCCn+1 on
their existing hardware.  If n+1 is slower, they get annoyed.

When that user upgrades their hardware, they say 'hey my *computer* is
faster', not 'hey gcc is faster'.

Their expenditure on new faster hardware does not get them faster
development cycles, if gcc eats it all up.

nathan
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