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[RISCV] Improve constant materialisation for stores of i8 negative co…
…nstants (#92131) This follows the same pattern as 20e6265. Although we can't reduce the number of instructions used, if we are able to use a sign-extended 6-bit immediate then the 16-bit c.li instruction can be selected (thus saving code size). Although this _could_ be gated so it only happens if C is enabled, I've opted not to because at worst it's neutral and it doesn't seem helpful to add unnecessary divergence between the RVC and non-RVC paths.
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