150082b0e3
Implement `${count()}` metavariable expression
This PR implements `${count()}` metavariable expression for MBE as described in [RFC 3086][rfc]. See [this section][sec-count] of the RFC for its semantics.
Additionally, this PR changes the type of depth parameter of `${index()}` from u32 to usize so as to match how [rustc parses it][index-usize].
Part of #11952
Fixes #14871
[rfc]: https://github.com/rust-lang/rfcs/pull/3086
[sec-count]: https://github.com/rust-lang/rfcs/blob/master/text/3086-macro-metavar-expr.md#count
[index-usize]:ddad0576ca/compiler/rustc_expand/src/mbe/metavar_expr.rs (L22)
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