[v3] typeinfo tuning

[Benjamin Kosnik]

I hacked up scripts/check_compile and ran the libstdc++ testsuite to
generate 4k+ .s files, and then analyzed the resulting assembly files
for vague linkage. 

Here are the clear wins that are ABI-compatible, or in C++0x code. There
are other issues, like the locale base classes, that are not as easy to
fix. There are a couple other issues in C++0x code that I am working
out, will post later today.

I'm holding off on this patch until branching is clear. But I thought
I'd post it so that this effort is public. It's set up for 4.6.0 but
may be moved to 4.7.0.

tested x86_64/linux

-benjamin
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