Revert "Revert "rustc: build with jemalloc""
Revert "Revert "rustc: build with jemalloc""

This reverts commit 539762709bb014f93f71dd825dc60003862c776f.

the x86_64-darwin on aarch64-darwin emulation issue was fixed by setting JEMALLOC_SYS_WITH_LG_VADDR

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs