chore: disable enable_cpp_symbolic_shape_guards (#23048)

Signed-off-by: Xiao Liu <xiszishu@gmail.com>

vllm/compilation/decorators.py

@@ -267,8 +267,24 @@ def _support_torch_compile(
                     code.co_filename)
                 return inline_call(parent, func, args, kwargs)
 
+            # Disable the C++ compilation of symbolic shape guards. C++-fication
+            # of symbolic shape guards can improve guard overhead. But, since
+            # vllm skip guards anyways, setting this flag to False can improve
+            # compile time.
+            dynamo_config_patches = {}
+            try:
+                _ = torch._dynamo.config.enable_cpp_symbolic_shape_guards
+                dynamo_config_patches[
+                    "enable_cpp_symbolic_shape_guards"] = False
+            except AttributeError:
+                # Note: this config is not available in torch 2.6, we can skip
+                # if the config doesn't exist
+                logger.debug(
+                    "enable_cpp_symbolic_shape_guards config not available")
+
             with patch.object(InliningInstructionTranslator, 'inline_call',
-                              patched_inline_call):
+                              patched_inline_call), torch._dynamo.config.patch(
+                                  **dynamo_config_patches):
                 output = self.compiled_callable(*args, **kwargs)
             return output