Sync third_party/tensorflow.

```
$ python3 scripts/git/update_tf_llvm_submodules.py
```

Closes https://github.com/google/iree/pull/1075

PiperOrigin-RevId: 300813835
diff --git a/SUBMODULE_VERSIONS b/SUBMODULE_VERSIONS
index af7a6b3..9905c4f 100644
--- a/SUBMODULE_VERSIONS
+++ b/SUBMODULE_VERSIONS
@@ -12,7 +12,7 @@
 b252a50953ac4375cb1864e94f4b0234db9d215d third_party/spirv_headers
 feb154921397dc8c43c130a6b5c123efdb432a9b third_party/spirv_tools
 6652f0b6428777b5a4a3d191cc30d8b31366b999 third_party/swiftshader
-a229588b9a2f937cdaf6ba4424a62815eee3ac79 third_party/tensorflow
+dfaa186344f0cf8a576976b699a3f7500f42e9c3 third_party/tensorflow
 8a457f8552d8d47ce3a96ed80a714ff6396f8ad8 third_party/vulkan_extensionlayer
 9bd3f561bcee3f01d22912de10bb07ce4e23d378 third_party/vulkan_headers
 909f36b714c9239ee0b112a321220213a474ba53 third_party/vulkan_memory_allocator
diff --git a/third_party/tensorflow b/third_party/tensorflow
index a229588..dfaa186 160000
--- a/third_party/tensorflow
+++ b/third_party/tensorflow
@@ -1 +1 @@
-Subproject commit a229588b9a2f937cdaf6ba4424a62815eee3ac79
+Subproject commit dfaa186344f0cf8a576976b699a3f7500f42e9c3