[RISCV] Change SEXT_B/SEXT_H/ZEXT_H_RV64 handling in isAllUsesReadW in SExtWRemoval.
These instrucitons only use the lower 8 or 16 bits. We don't need to look across them.
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These instrucitons only use the lower 8 or 16 bits. We don't need to look across them.