mainline performance

[Roger Sayle]

> Has the full build+check on the mainline slowed down several orders
> of magnitude for anyone other than me over the last few weeks?

I believe the problem is that several of the libjava tests are
now timing out after several minutes a piece.  I'd noticed the
problem on i686-pc-linux-gnu and assumed that it might have
been related to the recent x86 libffi changes, but if you're
seeing it on sparc64-*-linux, it must be something else.

Roger
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