Run test262 tests in CI

Run test262 tests for Linux, macOS and Cosmopolitan

Add a Makefile `test2-bootstrap` helper to clone and patch test262 tests at
a particular commit. Running with the latest commit noticed a few tests were
failing and added them to the errors list.

The CI environment, especially for macOS, was a bit more unpredictable and was
failing in atomics tests due to lower timeouts in the `atomicsHelper` so double
the timeouts. The time didn't worsen too much. It still takes about 2-3 min.

.github/workflows/ci.yml

@@ -36,6 +36,10 @@ jobs:
       - name: Run microbench
         run: |
           make microbench
+      - name: Run test262
+        run: |
+          make test2-bootstrap
+          make test2
 
   linux-lto:
     name: Linux LTO
@@ -67,6 +71,7 @@ jobs:
           submodules: true
       - name: Install gcc-multilib
         run: |
+          sudo apt update
           sudo apt install -y gcc-multilib
       - name: Build
         run: |
@@ -74,6 +79,10 @@ jobs:
       - name: Run built-in tests
         run: |
           make CONFIG_M32=y test
+      - name: Run test262
+        run: |
+          make test2-bootstrap
+          make CONFIG_M32=y test2
 
   linux-asan:
     runs-on: ubuntu-latest
@@ -138,6 +147,10 @@ jobs:
       - name: Run built-in tests
         run: |
           make test
+      - name: Run test262
+        run: |
+          make test2-bootstrap
+          make test2
 
   macos-asan:
     runs-on: macos-latest
@@ -173,6 +186,8 @@ jobs:
         uses: vmactions/freebsd-vm@v1
         with:
           usesh: true
+          copyback: false
+          mem: 16384
           prepare: |
             pkg install -y gmake
           run: |
@@ -202,6 +217,10 @@ jobs:
       - name: Run built-in tests
         run: |
           make CONFIG_COSMO=y test
+      - name: Run test262
+        run: |
+          make test2-bootstrap
+          make CONFIG_COSMO=y test2
 
   mingw-windows:
     name: MinGW Windows target