Auto merge of #74862 - mark-i-m:mv-compiler, r=petrochenkov

Move almost all compiler crates to compiler/

This PR implements https://github.com/rust-lang/compiler-team/issues/336 and moves all `rustc_*` crates from `src` to the new `compiler` directory.

`librustc_foo` directories are renamed to `rustc_foo`.
`src` directories are introduced inside `rustc_*` directories to mirror the scheme already use for `library` crates.

1 files changed, 11 insertions, 0 deletions

diff --git a/compiler/rustc_index/src/lib.rs b/compiler/rustc_index/src/lib.rs
new file mode 100644
index 00000000000..7ee881b0639
--- /dev/null
+++ b/compiler/rustc_index/src/lib.rs
@@ -0,0 +1,11 @@
+#![feature(allow_internal_unstable)]
+#![feature(bool_to_option)]
+#![feature(const_fn)]
+#![feature(const_panic)]
+#![feature(extend_one)]
+#![feature(unboxed_closures)]
+#![feature(test)]
+#![feature(fn_traits)]
+
+pub mod bit_set;
+pub mod vec;