use thread-safe indexmap

Author: SparrowLii

compiler/rustc_data_structures/Cargo.toml

@@ -10,7 +10,7 @@ arrayvec = { version = "0.7", default-features = false }
 bitflags = "1.2.1"
 cfg-if = "1.0"
 ena = "0.14.2"
-indexmap = { version = "1.9.3" }
+indexmap = { version = "1.9.3", features = ["rustc-rayon"] }
 jobserver_crate = { version = "0.1.13", package = "jobserver" }
 libc = "0.2"
 measureme = "10.0.0"
@@ -51,4 +51,4 @@ features = [
 memmap2 = "0.2.1"
 
 [features]
-rustc_use_parallel_compiler = ["indexmap/rustc-rayon", "rustc-rayon"]
+rustc_use_parallel_compiler = ["rustc-rayon"]