[RISCV] Fold shladd into Xqcisls scaled load/store in RISCVMergeBaseOffset (#182221) We can fold `shxadd\qc.shladd` into base+offset load/store instructions by transforming the load/store into `Xqcisls` scaled load/store instructions. For eg. ``` qc.e.li vreg1, s shxadd vreg2, vreg3, vreg1 lx vreg4, imm(vreg2) can be transformed to qc.e.li vreg1, s+imm qc.lrx vreg4, vreg1, vreg3, (1-7) ``` Such patterns are not folded during ISEL because the we prefer the `ShlAdd` in `isWorthFoldingIntoRegRegScale` which gives us better code in most cases. Test case were generated by an AI which I then hand-edited to add the negative cases.
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