[llvm] [cmake][runtimes] Refactor passthrough option handling into a macro (PR #198504)

[Raul Tambre via llvm-commits]

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@@ -91,6 +91,30 @@ macro(set_enable_per_target_runtime_dir)
   endif()
 endmacro()
 
+macro(append_passthrough_options out type names)
+  get_cmake_property(variable_names VARIABLES)
+
+  # Support multiple names for layering (e.g. multilibs).
+  foreach(name ${names})
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tambry wrote:

I'm just used to the old ways. :sweat_smile: 

https://github.com/llvm/llvm-project/pull/198504