[cxx-interop] Move CxxShim header from the SDK to the toolchain

rdar://105799283

Author: egorzhdan

stdlib/public/Cxx/cxxshim/CMakeLists.txt

@@ -43,15 +43,16 @@ foreach(sdk ${SWIFT_SDKS})
 
     swift_install_in_component(FILES libcxxshim.modulemap libcxxshim.h
                                DESTINATION "lib/swift/${arch_subdir}"
-                               COMPONENT sdk-overlay)
+                               COMPONENT compiler)
     if(SWIFT_BUILD_STATIC_STDLIB)
       swift_install_in_component(FILES libcxxshim.modulemap libcxxshim.h
                                  DESTINATION "lib/swift_static/${arch_subdir}"
-                                 COMPONENT sdk-overlay)
+                                 COMPONENT compiler)
     endif()
   endforeach()
 endforeach()
 
 add_custom_target(libcxxshim_modulemap DEPENDS ${libcxxshim_modulemap_target_list})
 set_property(TARGET libcxxshim_modulemap PROPERTY FOLDER "Miscellaneous")
 add_dependencies(sdk-overlay libcxxshim_modulemap)
+add_dependencies(compiler libcxxshim_modulemap)