[PATCH] Fix an instantiation error with nested generic lambdas and fptrs

[Faisal Vali]

Hi doug.gregor, rsmith,

This patch fixes the typelocs of the conversion operator and the conversion operator name and adds the parameters of the call operator to the FunctionProtoTypeLoc of these entities.  So when the template declarations (conversion operators) undergo deduction and instantiation/transformation/substitution - they add themselves to the local instantiation scope if needed.
 
auto L = [](auto b) {
   return [](auto a) ->decltype(a) { return a; };
 };
 int (*fp)(int) = L(8);

http://llvm-reviews.chandlerc.com/D1831

Files:
  lib/Sema/SemaLambda.cpp
  test/SemaCXX/cxx1y-generic-lambdas.cpp
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