message: [CMake] Add tf_cc_while_loop to the list of objects in tf_shared_lib.cmake.
  This addresses an unknown external symbol error when attempting to link the
  shared library.
  Partially addresses
diff: @@ -27,6 +27,7 @@ if(WIN32)
  $<TARGET_OBJECTS:tf_cc>
  $<TARGET_OBJECTS:tf_cc_framework>
  $<TARGET_OBJECTS:tf_cc_ops>
  + $<TARGET_OBJECTS:tf_cc_while_loop>
  $<TARGET_OBJECTS:tf_core_lib>
  $<TARGET_OBJECTS:tf_core_cpu>
  $<TARGET_OBJECTS:tf_core_framework>
  @@ -63,6 +64,7 @@ add_library(tensorflow SHARED
  $<TARGET_OBJECTS:tf_cc>
  $<TARGET_OBJECTS:tf_cc_framework>
  $<TARGET_OBJECTS:tf_cc_ops>
  + $<TARGET_OBJECTS:tf_cc_while_loop>
  $<TARGET_OBJECTS:tf_core_lib>
  $<TARGET_OBJECTS:tf_core_cpu>
  $<TARGET_OBJECTS:tf_core_framework>
  