[CMake] Fix add_llvm_loadble_module.

Thanks to Edward-san, to let me know.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198165 91177308-0d34-0410-b5e6-96231b3b80d8

Author: chapuni

cmake/modules/AddLLVM.cmake

@@ -134,13 +134,13 @@ ${name} ignored.")
       set(libkind SHARED)
     endif()
 
+    add_library( ${name} ${libkind} ${ALL_FILES} )
+    set_target_properties( ${name} PROPERTIES PREFIX "" )
+
     if (LLVM_EXPORTED_SYMBOL_FILE)
       add_llvm_symbol_exports( ${name} ${LLVM_EXPORTED_SYMBOL_FILE} )
     endif(LLVM_EXPORTED_SYMBOL_FILE)
 
-    add_library( ${name} ${libkind} ${ALL_FILES} )
-    set_target_properties( ${name} PROPERTIES PREFIX "" )
-
     llvm_config( ${name} ${LLVM_LINK_COMPONENTS} )
     link_system_libs( ${name} )