Revert "Enable C++ dynamic shape guards by default (pytorch#140756)"

This reverts commit dc0f09a.

Reverted pytorch#140756 on behalf of https://github.com/izaitsevfb due to seem to break dynamo tests ([comment](pytorch#140756 (comment)))

Author: pytorchmergebot

torch/_dynamo/config.py

@@ -398,7 +398,7 @@
 enable_cpp_guard_manager = True
 
 # Use C++ guard manger for symbolic shapes
-enable_cpp_symbolic_shape_guards = not is_fbcode()
+enable_cpp_symbolic_shape_guards = False
 
 # Enable tracing through contextlib.contextmanager
 enable_trace_contextlib = True