Bug fix (#65105)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65105
Using buildErrorMessage in external_functions.cpp was breaking build target nnc_cpu_backend_lib as buildErrorMessage is defined in tensorexpr/kernel.cpp which is not included in mobile builds and we don't want to include it in mobile builds.
Also buildErrorMessage wraps error messages for fuser whereas nnc_aten_conv2d is now only used in AOT workflow and not called by the fuser. So wrapping assertion failures with fuser error message would be misleading for AOT workflow.
Test Plan:
Before fix:
```
+ buck build //xplat/caffe2/fb/lite_predictor:lite_predictor_nnc
Downloading... 3/3 artifacts, 24.81 Kbytes, 0.0% cache miss (for updated rules)
Building... 1.7 sec (99%) 4639/4641 jobs, 3/4641 updated
- //xplat/caffe2/fb/lite_predictor:lite_predictor_nnc#binary... 0.7 sec (running c++ link[0.6 sec])
Command failed with exit code 1.
command: [/data/users/priyaramani/fbsource/buck-out/cells/fbcode/gen/aab7ed39/tools/build/buck/wrappers/__ld__/ld.sh, --ld=/data/users/priyaramani/fbsource/fbcode/third-party-buck/platform009/build/llvm-fb/9.0.0/bin/clang++, --cc=/data/users/priyaramani/fbsource/buck-out/cells/fbcode/gen/aab7ed39/tools/build/buck/wrappers/__fbc...
<truncated>
...
stderr: clang-9: warning: argument unused during compilation: '-pthread' [-Wunused-command-line-argument]
ld.lld: error: undefined symbol: torch::jit::tensorexpr::buildErrorMessage(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
>>> referenced by external_functions.cpp:69 (xplat/caffe2/torch/csrc/jit/tensorexpr/external_functions.cpp:69)
>>> ../nnc_cpu_backend_lib#compile-external_functions.cpp.o50e02bc2,platform009-clang/torch/csrc/jit/tensorexpr/external_functions.cpp.o:(nnc_aten_conv2d) in archive /data/users/priyaramani/fbsource/buck-out/gen/aab7ed39/xplat/caffe2/nnc_cpu_backend_lib#platform009-clang,static/libnnc_cpu_backend_lib.a
clang-9: error: linker command failed with exit code 1 (use -v to see invocation)
When running <c++ link>.
When building rule //xplat/caffe2/fb/lite_predictor:lite_predictor_nnc#binary (ovr_config//platform/linux:x86_64-fbcode).
clang-9: warning: argument unused during compilation: '-pthread' [-Wunused-command-line-argument]
ld.lld: error: undefined symbol: torch::jit::tensorexpr::buildErrorMessage(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
>>> referenced by external_functions.cpp:69 (xplat/caffe2/torch/csrc/jit/tensorexpr/external_functions.cpp:69)
>>> ../nnc_cpu_backend_lib#compile-external_functions.cpp.o50e02bc2,platform009-clang/torch/csrc/jit/tensorexpr/external_functions.cpp.o:(nnc_aten_conv2d) in archive /data/users/priyaramani/fbsource/buck-out/gen/aab7ed39/xplat/caffe2/nnc_cpu_backend_lib#platform009-clang,static/libnnc_cpu_backend_lib.a
clang-9: error: linker command failed with exit code 1 (use -v to see invocation)
Command failed with exit code 1.
command: [/data/users/priyaramani/fbsource/buck-out/cells/fbcode/gen/aab7ed39/tools/build/buck/wrappers/__ld__/ld.sh, --ld=/data/users/priyaramani/fbsource/fbcode/third-party-buck/platform009/build/llvm-fb/9.0.0[DEBUG kernel.cpp:2766] }
```
After fix:
```
+ buck build //xplat/caffe2/fb/lite_predictor:lite_predictor_nnc
Action graph will be rebuilt because files have been added or removed.
clang-9: warning: argument unused during compilation: '-pthread' [-Wunused-command-line-argument]
Downloaded 11/15 artifacts, 78.37 Kbytes, 15.4% cache miss (for updated rules)
Building: finished in 7.4 sec (100%) 4718/4718 jobs, 46/4718 updated
Total time: 7.5 sec
More details at https://www.internalfb.com/intern/buck/build/b87be016-340c-49f8-b832-0c1de70aae9e
```
Reviewed By: ZolotukhinM
Differential Revision: D30975952
fbshipit-source-id: 85c028cc6af63c03b505b51302f5158c23e1a047
