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This implements the parts of https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3457.htm which were adopted at the recent meeting in Brno. Clang already implemented `__COUNTER__`, but needed some changes for conformance. Specifically, we now diagnose when the macro is expanded more than 2147483647 times. Additionally, we now give the expected extension and pre-compat warnings for the feature. To support testing the limits, this also adds a -cc1-only option, `-finitial-counter-value=`, which lets you specify the initial value the `__COUNTER__` macro should expand to.
The LLVM Compiler Infrastructure
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