Fix `run_clang_repl` output when not present (#161412) On the happy path, when `clang-repl` is present, we will invoke it in order to determine if the host supports JIT features. That will return a string containing "true". However, in cases where `clang-repl` is not present or we fail to invoke it, we previously returned `False`, which would then trigger a failure with our substring check. This PR updates the function to return `""` instead, so the substring check is still valid. This is related to https://github.com/llvm/llvm-project/pull/157359, where the original change was introduced.
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