Use mimalloc as global_allocator for rustc_driver

Cargo.lock

@@ -2202,6 +2202,16 @@ version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4ec2a862134d2a7d32d7983ddcdd1c4923530833c9f2ea1a44fc5fa473989058"
 
+[[package]]
+name = "libmimalloc-sys"
+version = "0.1.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3979b5c37ece694f1f5e51e7ecc871fdb0f517ed04ee45f88d15d6d553cb9664"
+dependencies = [
+ "cc",
+ "libc",
+]
+
 [[package]]
 name = "libredox"
 version = "0.0.1"
@@ -2407,6 +2417,15 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "mimalloc"
+version = "0.1.39"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa01922b5ea280a911e323e4d2fd24b7fe5cc4042e0d2cda3c40775cdc4bdc9c"
+dependencies = [
+ "libmimalloc-sys",
+]
+
 [[package]]
 name = "mime"
 version = "0.3.17"
@@ -3737,6 +3756,7 @@ dependencies = [
 name = "rustc_driver"
 version = "0.0.0"
 dependencies = [
+ "mimalloc",
  "rustc_driver_impl",
 ]
 

compiler/rustc_driver/Cargo.toml

@@ -8,5 +8,6 @@ crate-type = ["dylib"]
 
 [dependencies]
 # tidy-alphabetical-start
+mimalloc = "0.1.39"
 rustc_driver_impl = { path = "../rustc_driver_impl" }
 # tidy-alphabetical-end

compiler/rustc_driver/src/lib.rs

@@ -5,4 +5,7 @@
 #![feature(rustdoc_internals)]
 #![doc(rust_logo)]
 
+#[global_allocator]
+static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
+
 pub use rustc_driver_impl::*;

src/tools/tidy/src/deps.rs

@@ -270,6 +270,7 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "leb128",
     "libc",
     "libloading",
+    "libmimalloc-sys",
     "linux-raw-sys",
     "litemap",
     "lock_api",
@@ -280,6 +281,7 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "memchr",
     "memmap2",
     "memoffset",
+    "mimalloc",
     "miniz_oxide",
     "nu-ansi-term",
     "num-conv",