forward fix preprocess multimethod

Summary: forward fix for preprocess multimethod tests. This adds extra dep for buck

Reviewed By: digantdesai

Differential Revision: D73134377

Author: mcr229

exir/backend/test/TARGETS

@@ -203,6 +203,7 @@ python_unittest(
         ":backend_with_preprocess_all_demo",
         "//caffe2:torch",
         "//caffe2/functorch:functorch_src",
+        "//executorch/exir/backend/test:backend_with_compiler_demo",
         "//executorch/exir:delegate",
         "//executorch/exir:graph_module",
         "//executorch/exir:lib",