ci: Add a test for x86-64 with 16-byte stack alignment

.gitlab-ci.yml

@@ -270,6 +270,26 @@ test-debian:
         - cd build && time meson test -v
     dependencies: []
 
+test-debian-unaligned-stack:
+    image: registry.videolan.org:5000/dav1d-debian-unstable:20190215130514
+    stage: test
+    tags:
+        - debian
+        - amd64
+    cache:
+        key: testdata.git-20190215
+        paths:
+            - cache/dav1d-test-data.git/
+    script:
+        - test -d cache || mkdir cache
+        - test -d cache/dav1d-test-data.git && GIT_DIR=cache/dav1d-test-data.git git fetch --refmap=refs/heads/master:refs/heads/master origin master
+        - test -d cache/dav1d-test-data.git || git clone --bare https://code.videolan.org/videolan/dav1d-test-data.git cache/dav1d-test-data.git
+        - git clone cache/dav1d-test-data.git tests/dav1d-test-data
+        - meson build --buildtype release -Dtestdata_tests=true -Dlogging=false -Dstack_alignment=16
+        - ninja -C build
+        - cd build && time meson test -v
+    dependencies: []
+
 test-debian-asan:
     image: registry.videolan.org:5000/dav1d-debian-unstable:20190215130514
     stage: test