[clang] [CIR] Add inline function attributes (PR #162866)

[Morris Hafner via cfe-commits]

mmha wrote:

I changed it back to manual parsing. `parseOptionalAttribute` causes the parser to still expect an empty dict if there's no inline attribute present. So the syntax is `inline(never|always|hint)` again which is more consistent with the other attributes. I did follow the suggestion to use the stringify function though.

https://github.com/llvm/llvm-project/pull/162866