[Patch] Substantive ostream bits of libstdc++/28277

[Paolo Carlini]

Hi,

the below fixes the actual testcases reported in the PR and now only the 
arithmetic inserters remain to be fixed. The idea is simply outputting 
padding chars and chars in the proper order, instead of constructing the 
result in a temporary buffer (allocated on the stack). Something I like 
about the fix solicited by the PR is that the work is done in a single 
new _M_insert, which is reused for 6 different inserters overall, thus 
reducing ostream.tcc to the minimal terms. The PR also prompted 
implementing the proposed resolution of DR 586: I hope you all agree 
with me that whereas not ready yet seems pretty straightforward, 
otherwise we have to special case string inserters.

Tested x86/ia64-linux, will wait a while before going ahead (if people 
prefer I can add the 2 new exports @3.4.10 instead of the current 3.4.9, 
just let me know)

Paolo.

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