Add per-VM execution timing to main.rs

[Copilot]

Track and report cumulative execution time for both patch and sched VMs in src/main.rs to enable performance comparison between the two implementations when running against corpus files.

Changes

• Timing instrumentation in src/main.rs — each call to patch::run() and sched::run() (for both version 0 and version 2) is wrapped with std::time::Instant, accumulating nanoseconds into patch_vm_total_ns and sched_vm_total_ns
• Per-directory reporting — after processing each corpus directory, the totals are printed:

patch_vm_total=123ms sched_vm_total=456ms

Timing uses u128 accumulators to safely handle large cumulative nanosecond values across all corpus files.

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[Copilot]

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[gpBlockchain]

不是补充在fuzz里，是补充在main.rs @copilot

[Copilot]

不是补充在fuzz里，是补充在main.rs @copilot

Done in commit b65e8b5. Timing is now in src/main.rs — each patch::run() and sched::run() call is wrapped with std::time::Instant, and after processing each corpus directory the totals are printed:

patch_vm_total=123ms sched_vm_total=456ms