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This reverts commit 615eb855. It was originally intended to fix #24449, but it was merely sweeping the bug under the rug. 3836a110 has properly fixed the fragile test, and we no longer need the C version of genSym. Furthermore, the C implementation causes trouble when compiling with clang that targets i386 due to alignment warning and libatomic linking issue, so it makes sense to revert it.
39f3ac3e