[MLIR] Fix ML IR build on Windows with Visual Studio

[stella.stamenova]

Summary

Right now the path for each lib in whole_archive_link when MSVC is used as the compiler is not a full path - and it's not even the correct path when VS is used to build. This patch sets the lib path to a full path using CMAKE_CFG_INTDIR which means the path will be correct regardless of whether ninja, make or VS is used and it will always be a full path.

[jpienaar]

Thanks!

mlir/CMakeLists.txt

 function(whole_archive_link target)
   if("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
     set(link_flags "-L${CMAKE_BINARY_DIR}/lib ")
     FOREACH(LIB ${ARGN})
       string(CONCAT link_flags ${link_flags} "-Wl,-force_load ${CMAKE_BINARY_DIR}/lib/lib${LIB}.a ")
     ENDFOREACH(LIB)
   elseif(MSVC)
     FOREACH(LIB ${ARGN})
-      string(CONCAT link_flags ${link_flags} "/WHOLEARCHIVE:lib/${LIB}.lib ")
+      string(CONCAT link_flags ${link_flags} "/WHOLEARCHIVE:${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib/${LIB}.lib ")
     ENDFOREACH(LIB)
   else()
     set(link_flags "-L${CMAKE_BINARY_DIR}/lib -Wl,--whole-archive,")
     FOREACH(LIB ${ARGN})
       string(CONCAT link_flags ${link_flags} "-l${LIB},")
     ENDFOREACH(LIB)
     string(CONCAT link_flags ${link_flags} "--no-whole-archive")
   endif()