[auto] Update onnx to 8b7a925 - a few more shape inference functions (#772)

onnxbot · onnxbot · commit bdd27ea95676 · 2018-04-27T19:06:58.000Z
onnx/onnx@8b7a925
diff --git a/third_party/onnx b/third_party/onnx
@@ -1 +1 @@
-Subproject commit 9718f42976fbf4c7cecdaa5d753a7d39b9d70361
+Subproject commit 8b7a9252c9826867b37c472a0e253d84ae17f857
