bug 1398799: don't add depedencies when current task and upstream task don't have a matching build platform. r=aki

taskcluster/taskgraph/transforms/release_deps.py

@@ -59,6 +59,11 @@ def add_dependencies(config, jobs):
             dep_phase = dep_task.attributes.get('shipping_phase')
             if dep_phase and PHASES.index(dep_phase) > PHASES.index(phase):
                 continue
+
+            if dep_task.attributes.get("build_platform") and \
+               job.get("attributes", {}).get("build_platform"):
+                if dep_task.attributes["build_platform"] != job["attributes"]["build_platform"]:
+                    continue
             # Add matching product tasks to deps
             if _get_product(dep_task.task) == product or \
                     dep_task.attributes.get('shipping_product') == product: