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Add jemalloc as an alternative malloc implementation for the Verilator binary. When both tcmalloc and jemalloc are available, jemalloc is preferred due to its better performance on RTLMeter. The new --enable-jemalloc flag (default=check) mirrors the existing --enable-tcmalloc behavior: auto-detected at configure time, supports both static and dynamic linking, and is disabled when --enable-dev-asan is active.