Implement RustcInternal for StableBody

Author: artemagvanian

Cargo.lock

@@ -4715,6 +4715,7 @@ dependencies = [
  "rustc_ast_pretty",
  "rustc_data_structures",
  "rustc_hir",
+ "rustc_index",
  "rustc_middle",
  "rustc_session",
  "rustc_span",

compiler/rustc_smir/Cargo.toml

@@ -10,6 +10,7 @@ rustc_ast = { path = "../rustc_ast" }
 rustc_ast_pretty = { path = "../rustc_ast_pretty" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_hir = { path = "../rustc_hir" }
+rustc_index = { path = "../rustc_index" }
 rustc_middle = { path = "../rustc_middle" }
 rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }