rustc: build with jemalloc

This change should fix intermittent crashes on macOS Monterey.

Co-authored-by: Pavol Rusnak <pavol@rusnak.io>

pkgs/development/compilers/rust/rustc.nix

@@ -100,6 +100,9 @@ in stdenv.mkDerivation rec {
     "${setHost}.musl-root=${pkgsBuildHost.targetPackages.stdenv.cc.libc}"
   ] ++ optionals stdenv.targetPlatform.isMusl [
     "${setTarget}.musl-root=${pkgsBuildTarget.targetPackages.stdenv.cc.libc}"
+  ] ++ optionals (stdenv.isDarwin && stdenv.isx86_64) [
+    # https://github.com/rust-lang/rust/issues/92173
+    "--set rust.jemalloc"
   ];
 
   # The bootstrap.py will generated a Makefile that then executes the build.