[flang-commits] [flang] [flang] Add EXECUTE_COMMAND_LINE runtime and lowering intrinsics implementation (PR #74077)

[Peter Klausler via flang-commits]

klausler wrote:

Given that you have implementations using `fork()` and its Windows analog, why have synchronous implementations with `system()`?  Can't the synchronous path just use the asynchronous implementation with synchronization?

https://github.com/llvm/llvm-project/pull/74077