[Patch] libstdc++/28080, more

[Paolo Carlini]

Hi,

the below continues the work: besides the straightforward tr1/random and 
tr1/memory bits (usual idea of avoiding the whole, big <algorithm>, when 
possible), I'm also splitting out from <tr1/functional> the hash 
functions to functional_hash.h: this allows to include only the latter 
in tr1/unordered_map and unordered_set and the compilation of those 
headers alone becomes about 3 times faster, because we avoid all the 
preprocessor metaprogramming (the  preprocessed headers are also less 
than half the size).

Hoping for variadic templates to go in mainline relatively soon (after 
Oxford?), the latter changes, very safe anyway, seem particularly 
important for the 4_2-branch, and I mean to commit there too.

Tested without PCHs too, x86/x86_64-linux.

Paolo.

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