[PATCH] [libcxx] Create <__invoke> header that generates the __invoke and __invoke_constexpr functions.

[Eric Fiselier]

@rsmith Could you please look at the latest reproducer on the following bug (https://llvm.org/bugs/show_bug.cgi?id=23141). Is there a way to work around that code while having a constexpr `__invoke`?


http://reviews.llvm.org/D9730

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