[CMake] Remove LLVM link code (#134940)

This handling is not needed no recent LLVM APIs.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/134940
Approved by: https://github.com/ezyang, https://github.com/malfet

caffe2/CMakeLists.txt

@@ -904,15 +904,6 @@ if(USE_LLVM AND LLVM_FOUND)
     support core analysis executionengine instcombine
     scalaropts transformutils ${LLVM_TARGETS_TO_BUILD} orcjit)
   target_link_libraries(torch_cpu PRIVATE ${LLVM_LINK_LIBS})
-  if(APPLE)
-    set(LINKER_SCRIPT "${CMAKE_CURRENT_SOURCE_DIR}/unexported_symbols.lds")
-    set_target_properties(torch_cpu PROPERTIES LINK_DEPENDS ${LINKER_SCRIPT})
-    set_target_properties(torch_cpu PROPERTIES LINK_FLAGS "-Wl,-unexported_symbols_list,${LINKER_SCRIPT}")
-  elseif(UNIX)
-    set(LINKER_SCRIPT "${CMAKE_CURRENT_SOURCE_DIR}/version_script.lds")
-    set_target_properties(torch_cpu PROPERTIES LINK_DEPENDS ${LINKER_SCRIPT})
-    target_link_libraries(torch_cpu PRIVATE "-Wl,--version-script=${LINKER_SCRIPT}")
-  endif()
 endif(USE_LLVM AND LLVM_FOUND)
 
 # This is required for older versions of CMake, which don't allow

caffe2/unexported_symbols.lds

@@ -1 +0,0 @@
-*4llvm*

caffe2/version_script.lds

@@ -1,4 +0,0 @@
-pytorch {
-  local:
-    *4llvm*;
-};