In Microsoft mode, if we are within a templated function and we can't resolve...

In Microsoft mode, if we are within a templated function and we can't resolve Identifier during BuildCXXNestedNameSpecifier, then extend the SS with Identifier. This will have  the effect of resolving Identifier during template instantiation.  The goal is to be able to resolve a function call whose nested-name-specifier is located inside a dependent base class.

class C {
public:
    static void foo2() {  }
};

template <class T> class A {
public:
   typedef C D;
};

template <class T> class B : public A<T> {
public:
  void foo() { D::foo2(); }
};

Note that this won't work if the NestedNameSpecifier refers to a type.
This fixes 1 error when parsing the MSVC 2010 standard headers file with clang.

llvm-svn: 136203