[libcxx-commits] [libcxx] [libc++] Add missing %{flags} substitution to clang-tidy (PR #171689)

[Louis Dionne via libcxx-commits]

ldionne wrote:

> FWIW IMO `%{flags}` is a bad name here. I expected `%{compile_flags}` to contain all flags that should be used when compiling, `%{link_flags}` to contain all flags that should be used when linking, and `%{flags}` to contain all flags that should be used when compiling and linking in one command.

Perhaps `%{common_flags}` would be a better name?

https://github.com/llvm/llvm-project/pull/171689