[PATCH] Sema: Do not allow template declarations inside local classes

[David Majnemer]

Hi eli.friedman, rsmith, doug.gregor, faisalv,

Enforce the rule in C++11 [temp.mem]p2 that local classes cannot have
member templates.

This fixes PR16947.

N.B.  C++14 has slightly different wording to afford generic lambdas
declared inside of functions.

Fun fact:  Some formulations of local classes with member templates
would cause clang to crash during Itanium mangling, such as the
following:

void outer_mem() {
  struct Inner {
    template <typename = void>
    struct InnerTemplateClass {
      static void itc_mem() {}
    };
  };
  Inner::InnerTemplateClass<>::itc_mem();
}

http://llvm-reviews.chandlerc.com/D1866

Files:
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/Sema/SemaTemplate.cpp
  test/CXX/temp/temp.decls/temp.mem/p2.cpp
  test/CodeGenCXX/mangle-local-class-names.cpp
  test/PCH/cxx-local-templates.cpp
  test/PCH/cxx1y-local-templates.cpp
  test/SemaTemplate/instantiate-exception-spec-cxx11.cpp
  test/SemaTemplate/local-member-templates.cpp
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