Reapply "[RISCV] Rework memcpy test (#120364)"

Use descriptive names and add more cases.

This recommits 59bba39 which was reverted in 4637c77.
This commit is contained in:
Pengcheng Wang 2025-01-13 11:28:24 +08:00 committed by Wang Pengcheng
parent 4637c77746
commit 681c4a2068

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