[PATCH] D65227: clang-format: Support `if CONSTEXPR` if CONSTEXPR is a macro.

[Nico Weber via Phabricator via cfe-commits]

thakis created this revision.
thakis added a reviewer: klimek.

This is like r305666 (which added support for `if constexpr`) except
that it allows a macro name after the if.

This is slightly tricky for two reasons:

1. r305666 didn't add test coverage for all cases where it added a kw_constexpr, so I had to figure out what all the added cases were for. I now added tests for all `if consexpr` bits that didn't have tests. (This took a while, see e.g. https://reviews.llvm.org/D65223)

2. Parsing 'if <ident> (` as an if means that `#if defined(` and `#if __has_include(` parse as ifs too. Add some special-case code to prevent this from happening where it's incorrect.

Fixes PR39248.


https://reviews.llvm.org/D65227

Files:
  clang/lib/Format/ContinuationIndenter.cpp
  clang/lib/Format/FormatToken.h
  clang/lib/Format/TokenAnnotator.cpp
  clang/lib/Format/UnwrappedLineParser.cpp
  clang/unittests/Format/FormatTest.cpp

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