[MLIR][cmake][NFC] Update linkage checker for mlir-opt

[stephenneuendorffer]

Summary

New CMakeLists.txt for MLIRStandardOpsTransforms was incorrect, but wasn't
caught by the check.

mlir/cmake/modules/AddMLIR.cmake

foreach(lib ${libs})
         if(${lib} MATCHES "^LLVM$")
           set(linking_llvm 1)
         endif()
         if((${lib} MATCHES "^LLVM.+") AND ${linking_llvm})
           # This will almost always cause execution problems, since the
           # same symbol might be loaded from 2 separate libraries.  This
           # often comes from referring to an LLVM library target
           # explicitly in target_link_libraries()
-          message("WARNING: ${l} links LLVM and ${lib}!")
+          message("WARNING: ${name} links LLVM and ${lib}!")
         endif()
       endif()
     endforeach()
   endif()
 endfunction(mlir_check_link_libraries)
 
 function(mlir_check_all_link_libraries name)
   mlir_check_link_libraries(${name})
   if(TARGET ${name})
     get_target_property(libs ${name} LINK_LIBRARIES)
     # message("${name} libs are: ${libs}")
     foreach(lib ${libs})
       mlir_check_link_libraries(${lib})
     endforeach()
   endif()
 endfunction(mlir_check_all_link_libraries)

mlir/tools/mlir-opt/CMakeLists.txt

add_llvm_tool(mlir-opt
   mlir-opt.cpp
 
   DEPENDS
   ${LIBS}
   )
 target_link_libraries(mlir-opt PRIVATE ${LIBS})
 llvm_update_compile_flags(mlir-opt)
 
-mlir_check_link_libraries(mlir-opt)
+mlir_check_all_link_libraries(mlir-opt)