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cd058033b9
When building runtimes, the compiler name (e.g. clang, clang-cl) is set based on `CMAKE_SYSTEM_NAME` passed to `llvm_ExternalProject_Add()` through `CMAKE_ARGS` argument. This mechanism doesn't work well if the target is Windows host. `runtime_default_target()`/`builtin_default_target()` doesn't provide a way to specify `CMAKE_SYSTEM_NAME` and doesn't set it either. This patch appends variables specified in `RUNTIMES_CMAKE_ARGS`/`BUILTINS_CMAKE_ARGS` to `CMAKE_ARGS` argument of `llvm_ExternalProject_Add()` in the case of called from `runtime_default_target()`/`builtin_default_target()` thus in particular it allows passing CMAKE_SYSTEM_NAME whenever it is required. Reviewed By: phosek, compnerd, plotfi Differential Revision: https://reviews.llvm.org/D81877