RFA (libstdc++): C++/v3 PATCH for c++/24163 (lookup in dependent bases) and c++/29131

[Jason Merrill]

G++ has had a long-standing bug with unqualified name resolution in 
templates: if we didn't find any declaration when looking up a name in 
the template definition, we would do an additional unqualified lookup at 
the point of instantiation.  This led to incorrectly finding 
namespace-scope functions declared later (29131) and member functions of 
dependent bases (24163).  This patch fixes that bug.

To be friendly to users, the patch also allows affected code to compile 
with -fpermissive and provides suggestions about how to fix the code: 
either declaring the desired function earlier (29131) or explicitly 
qualifying the name with this-> or Class:: (24163).

This caused a lot of regressions in the libstdc++ testsuite, which I've 
fixed.  To find names in dependent bases, I've added explicit this-> in 
non-static member functions, and explicit Class:: in static member 
functions.  I'd like confirmation from the library folks that this is 
the style they want to use for this.

There were also a couple of issues with calls to functions that hadn't 
been declared yet; library folks should definitely check my formatting 
on the forward declarations I've added, for mem_fn in functional and for 
__expint_E1 in exp_integral.tcc.

Tested x86_64-pc-linux-gnu.  Are the library changes OK for trunk?
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