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[v3] add pch anchor files

From: Benjamin Kosnik <bkoz at redhat dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: libstdc++ at gcc dot gnu dot org
Date: Thu, 13 Jul 2006 14:32:58 -0500
Subject: [v3] add pch anchor files

Well.....

We had:

stdc++.h.gch
stdc++.h.gch/O0g.gch
stdc++.h.gch/O2g.gch

but no

stdc++.h

Without this last file, 

g++ -include bits/stdc++.h -O2 -g foo.cc

and

g++ -include bits/stdc++.h -O0 -g foo.cc

work fine.

However, 

g++ -include bits/stdc++.h -pthreads -O2 -g foo.cc

fails to compile, since neither of the two existing PCH files can be
used, and the backup, which is to include the actual ".h" file, doesn't
exist.

This adds the stub files back in, and also installs them so that usage can be consistent.

Found while running the performance tests. Which have been tweaked to now show compile errors more verbosely.

tested x86/linux
performance tested x86/linux

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