Reapply "various: fix Scudo allocator due to LLVM update"

This reverts commit 5119cafc59.

nixos/modules/config/malloc.nix

@@ -52,7 +52,7 @@ let
             or (throw "scudo not supported on ${pkgs.stdenv.hostPlatform.system}");
       in
       {
-        libPath = "${pkgs.llvmPackages.compiler-rt}/lib/linux/libclang_rt.scudo-${systemPlatform}.so";
+        libPath = "${pkgs.llvmPackages.compiler-rt}/lib/linux/libclang_rt.scudo_standalone-${systemPlatform}.so";
         description = ''
           A user-mode allocator based on LLVM Sanitizer’s CombinedAllocator,
           which aims at providing additional mitigations against heap based

nixos/modules/profiles/hardened.nix

@@ -39,7 +39,7 @@ in
     nix.settings.allowed-users = mkDefault [ "@users" ];
 
     environment.memoryAllocator.provider = mkDefault "scudo";
-    environment.variables.SCUDO_OPTIONS = mkDefault "ZeroContents=1";
+    environment.variables.SCUDO_OPTIONS = mkDefault "zero_contents=true";
 
     security.lockKernelModules = mkDefault true;
 

pkgs/development/compilers/llvm/common/compiler-rt/default.nix

@@ -102,7 +102,7 @@ stdenv.mkDerivation (finalAttrs: {
   env = {
     NIX_CFLAGS_COMPILE = toString (
       [
-        "-DSCUDO_DEFAULT_OPTIONS=DeleteSizeMismatch=0:DeallocationTypeMismatch=0"
+        "-DSCUDO_DEFAULT_OPTIONS=delete_size_mismatch=false:dealloc_type_mismatch=false"
       ]
       ++ lib.optionals (!haveLibc) [
         # The compiler got stricter about this, and there is a usellvm patch below