Maintain a graph of fulfilled conditions.

Author: cjgillot

Cargo.lock

@@ -4255,7 +4255,6 @@ dependencies = [
  "hashbrown",
  "itertools",
  "rustc_abi",
- "rustc_arena",
  "rustc_ast",
  "rustc_const_eval",
  "rustc_data_structures",

compiler/rustc_mir_transform/Cargo.toml

@@ -9,7 +9,6 @@ either = "1"
 hashbrown = "0.15"
 itertools = "0.12"
 rustc_abi = { path = "../rustc_abi" }
-rustc_arena = { path = "../rustc_arena" }
 rustc_ast = { path = "../rustc_ast" }
 rustc_const_eval = { path = "../rustc_const_eval" }
 rustc_data_structures = { path = "../rustc_data_structures" }