Remove backend_debug from torch_core srcs and replace with library dependency (#63111)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63111

### Problem:
Buck contains at least two libraries which have `backend_debug_info.cpp` as a source, `torch_core` and `backend_interface_lib`. `backend_debug_info.cpp` registers BackendDebugInfo as a class. If targets contain both libraries (e.g. sparkAR debug build with NNAPI delegation), then BackendDebugInfo is registered twice, causing a runtime error.
### Solution:
These changes remove `backend_debug_info.cpp` and `backend_interface.cpp` as a source in `torch_core` and adds backend_interface_lib as a dependency instead.

**build_variables.bzl:**
- Added a list that excludes `backend_debug_info.cpp` and `backend_interface.cpp` ( both srcs already included by `backend_interface_lib`)

**buck:**
- torch_core: Removed `backend_debug_info.cpp` from srcs and added `backend_interface_lib` deps
- backend_interface_lib: Replaced `torch_mobile_core` dep with more specific deps
  - to avoid an indirect dep between `torch_core` and `torch_mobile_core`

ghstack-source-id: 135981061

Test Plan:
### Test Plan:
Build and run SparkAR internally with Android NNAPI Delegation (`buck build --show-output arstudioplayer_arm64_debug`)
and internal tests.

Reviewed By: iseeyuan

Differential Revision: D30259034

fbshipit-source-id: 0c14c827732f07fb9b9bd25a999828b51793cdcc

diff --git a/tools/build_variables.bzl b/tools/build_variables.bzl
index 7ab051f..89697b4 100644 (file)
--- a/tools/build_variables.bzl
+++ b/tools/build_variables.bzl
@@ -145,14 +145,12 @@ core_trainer_sources = [
     "torch/csrc/jit/serialization/type_name_uniquer.cpp",
 ]
 
-core_sources_full_mobile = [
+core_sources_full_mobile_no_backend_interface = [
     "torch/csrc/jit/api/function_impl.cpp",
     "torch/csrc/jit/api/module.cpp",
     "torch/csrc/jit/api/object.cpp",
     "torch/csrc/jit/backends/backend_debug_handler.cpp",
-    "torch/csrc/jit/backends/backend_debug_info.cpp",
     "torch/csrc/jit/backends/backend_detail.cpp",
-    "torch/csrc/jit/backends/backend_interface.cpp",
     "torch/csrc/jit/backends/backend_resolver.cpp",
     "torch/csrc/jit/codegen/fuser/codegen.cpp",
     "torch/csrc/jit/codegen/fuser/compiler.cpp",
@@ -320,6 +318,11 @@ core_sources_full_mobile = [
     "torch/csrc/utils/variadic.cpp",
 ] + libtorch_profiler_sources
 
+core_sources_full_mobile = core_sources_full_mobile_no_backend_interface + [
+    "torch/csrc/jit/backends/backend_debug_info.cpp",
+    "torch/csrc/jit/backends/backend_interface.cpp",
+]
+
 core_sources_full = core_sources_full_mobile + [
     "torch/csrc/jit/runtime/static/fusion.cpp",
     "torch/csrc/jit/runtime/static/impl.cpp",