[clang] [clang-format] Don't case-fix numeric literals in macro invocations (PR #212328)

[via cfe-commits]

owenca wrote:

clang-format has always used the raw lexer, which lexes both `1616header.h` and `1616header` as `numeric_constant`. We can easily skip C/C++ preprocessor directives, but the user should use `// clang-format off` for other cases.

https://github.com/llvm/llvm-project/pull/212328