06daa9e263
stabilize abi_thiscall Closes https://github.com/rust-lang/rust/issues/42202, stabilizing the use of the "thiscall" ABI. FCP was substituted by a poll, and the poll has been accepted.
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.