Auto merge of #74932 - nnethercote:rm-ast-session-globals, r=petrochenkov

Remove `librustc_ast` session globals

By moving the data onto `Session`.

r? @petrochenkov

Author: bors

Cargo.lock

@@ -3195,7 +3195,6 @@ dependencies = [
  "rustc_macros",
  "rustc_serialize",
  "rustc_span",
- "scoped-tls",
  "smallvec 1.4.0",
  "tracing",
 ]

src/librustc_ast/Cargo.toml

@@ -12,7 +12,6 @@ doctest = false
 [dependencies]
 rustc_serialize = { path = "../librustc_serialize" }
 log = { package = "tracing", version = "0.1" }
-scoped-tls = "1.0"
 rustc_span = { path = "../librustc_span" }
 rustc_data_structures = { path = "../librustc_data_structures" }
 rustc_index = { path = "../librustc_index" }