Bug 1401504 Fix balrog platform used for linux32 lookups r=jlorenzo

MozReview-Commit-ID: 5sFW4qxj4dU

--HG--
extra : rebase_source : 194926a02f480fdb4a9a6bc1640e71e17939358c

taskcluster/taskgraph/util/partials.py

@@ -22,6 +22,9 @@ BALROG_PLATFORM_MAP = {
     "linux": [
         "Linux_x86-gcc3"
     ],
+    "linux32": [
+        "Linux_x86-gcc3"
+    ],
     "linux64": [
         "Linux_x86_64-gcc3"
     ],