[v3] typelist::detail::type_to_type removal

[Benjamin Kosnik <bkoz at redhat dot com>]

This removes some cruft in the typelist implementation, which should
make this code easier to understand. (Or, possible to understand.) It
should now be possible to remove the duplicate type_to_type in
pb_ds/detail/type_utils.h.

While debugging this change to the performance testsuite, I noticed
that the previously checked in throw_allocator was not pretty-printing
memory allocations correctly, and that the facilities for checking
allocated memory by a specified "label" were not present. So, I added
them. Mostly, I had to do this because -O0 is not working now (?) and
or giving different results from -O1 and -O2,  and gdb was useless with
this highly templatized code.

-benjamin

tested x86/linux
tested x86/linux abi
tested x86/linux performance

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