subrepo and update asm-differ (#1664)

* git subrepo clone git@github.com:simonlindholm/asm-differ.git tools/asm-differ

subrepo:
  subdir:   "tools/asm-differ"
  merged:   "11eee5916"
upstream:
  origin:   "git@github.com:simonlindholm/asm-differ.git"
  branch:   "main"
  commit:   "11eee5916"
git-subrepo:
  version:  "0.4.6"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "110b9eb"

* ln -s ./tools/asm-differ/diff.py diff.py

tools/asm-differ/.github/workflows/black.yml

@@ -0,0 +1,15 @@
+name: black
+
+on:
+  pull_request:
+  push:
+
+permissions: read-all
+
+jobs:
+  black:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: python3 -m pip install --user colorama watchdog levenshtein cxxfilt black==23.12.1
+      - run: python3 -m black .

tools/asm-differ/.github/workflows/check-poetry-lock.yml

@@ -0,0 +1,20 @@
+name: flake check
+
+on:
+  pull_request:
+  push:
+
+permissions: read-all
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      # Install `nix` which is just a dead-simple way to get a stable `poetry`
+      # in scope.
+      - uses: cachix/install-nix-action@v20
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+      # Check that poetry.lock is in sync with pyproject.toml
+      - run: nix run github:NixOS/nixpkgs/22.11#poetry -- lock --check

tools/asm-differ/.github/workflows/unit-tests.yml

@@ -0,0 +1,15 @@
+name: unit tests
+
+on:
+  pull_request:
+  push:
+
+permissions: read-all
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - run: python3 -m pip install --user colorama watchdog levenshtein cxxfilt
+      - run: python3 test.py