[clang] [C++26] [Contracts] Initial parser support (PR #221139)

[Erich Keane via cfe-commits]

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+// RUN: %clang_cc1 -std=c17 -fcontracts -fsyntax-only -verify %s
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+// Contracts are a C++ feature. Enabling the parser option in C mode must not
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erichkeane wrote:

So they are contextual keywords, right?  Can we have some tests that make sure we don't stomp on these in both of the C++ modes too?  (Even with it enabled).

Also, this doesn't check against contextual keywords, since you never use it in a contextual-keyword-location.

https://github.com/llvm/llvm-project/pull/221139