From: Gary Guo <gary@xxxxxxxxxxx>
Add the `quote!` macro for creating `TokenStream`s directly via the
given Rust tokens. It also supports repetitions using iterators.
It will be used by the pin-init API proc-macros to generate code.
Signed-off-by: Gary Guo <gary@xxxxxxxxxxx>
Signed-off-by: Benno Lossin <y86-dev@xxxxxxxxxxxxxx>