The directives should not change the indentation level. Previously the
program erroneously added an indentation level when it saw the
`function` keyword.

The brace wrapping for Java records should now behave similar to
classes. Before, opening braces for Java records were always placed in
the same line as the record definition.

This patch replaces LLVM_ATTRIBUTE_UNUSED with [[maybe_unused]],
introduced as part of C++17.

`UnwrappedLineParser::parseBracedList` had no
explicit handling for the `requires` keyword, so it would just call
`nextToken()` instead of properly parsing the `requires` expression.

This fix adds a case for `tok::kw_requires` in `parseBracedList`,
calling `parseRequiresExpression` to handle it correctly, matching the
existing behavior in `parseParens`.

Fixes https://github.com/llvm/llvm-project/issues/162984.

And apply throughout the code base.

Fixes #160518

Allow an option to leave preprocessor directive indenting as-is. This
simplifies handling mixed styles of CPP directive indentation.

Fixes #38511

All comments before the macro definition body should be skipped.

Fixes #154683

This allows RemoveParentheses to skip the invocations of function-like
macros.

Fixes #68354.
Fixes #147780.