[Clang][C2y] Add support for if declarations (N3356 paper) (#198244) Add support for _if declarations_ in `C2y` mode by exploiting existing C++ code. The only new changes to the code is narrowing the code path to `C` mode and introduce new errors and warnings for some pitfalls with the syntax and what is expected from the standard and old language modes. It should be noted that the first clause in the standard paper can only be declaration. This means we can't allow expression statement in the first clause of the condition, and that's the goal of the new warnings/errors. Also this is different from C++ grammar.
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