[Kernel][Misc] register ops to prevent graph breaks (#6917)

Co-authored-by: Sage Moore <sage@neuralmagic.com>

vllm/envs.py

@@ -203,6 +203,11 @@ environment_variables: Dict[str, Callable[[], Any]] = {
     (os.environ.get("VLLM_DYNAMO_USE_CUSTOM_DISPATCHER", "True").lower() in
      ("true", "1")),
 
+    # Internal flag to enable Dynamo fullgraph capture
+    "VLLM_TEST_DYNAMO_FULLGRAPH_CAPTURE":
+    lambda: bool(
+        os.environ.get("VLLM_TEST_DYNAMO_FULLGRAPH_CAPTURE", "1") != "0"),
+
     # local rank of the process in the distributed setting, used to determine
     # the GPU device id
     "LOCAL_RANK":