IAR: Add response flag for files

This Merge Request changes the following for the IAR Toolchains

• Added CMAKE_${lang}_RESPONSE_FILE_FLAG.

• CMAKE_${lang}_RESPONSE_FILE_FLAG and CMAKE_${lang}_RESPONSE_FILE_LINK_FLAG now applies to C, CXX and ASM. Response files can now be used for building targets purely made of Assembly.

• Code de-duplication by using the __compiler_iar_common() macro:

  • The following variables serves for both xlink and ilink (C and CXX):
    • CMAKE_${lang}_COMPILE_OBJECT,
    • CMAKE_${lang}_CREATE_PREPROCESSED_SOURCE,
    • CMAKE_${lang}_CREATE_ASSEMBLY_SOURCE and
    • CMAKE_${lang}_FLAGS_*_INIT
  • Response file flags (C, CXX and ASM):
    • CMAKE_${lang}_RESPONSE_FILE_FLAG
    • CMAKE_${lang}_RESPONSE_FILE_LINK_FLAG
  • Archive Finish
    • CMAKE_${lang}_ARCHIVE_FINISH - it is the same for both linker technologies

• Testbenches:

  • https://gitlab.kitware.com/felipe-iar/big-project
  • https://github.com/iarsystems/cmake-tutorial/tree/master/tests

• Observation related to #19213 (closed):

  • Once CMAKE_NINJA_FORCE_RESPONSE_FILE is set, CMAKE_${lang}_USE_RESPONSE_FILES_FOR_OBJECTS is automatically set.

Fixes #19213 (closed).