riscv64: Rollback isub const LHS optimization
#7491
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* wasi-http: Reject delete of forbidden headers (#7490) * Don't delete forbidden headers * Make delete return a result * Fix test that wasn't updated for fallible delete changes * riscv64: Rollback isub lhs optimization (#7491) --------- Co-authored-by: Trevor Elliott <telliott@fastly.com> Co-authored-by: Afonso Bordado <afonso360@users.noreply.github.com>
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👋 Hey,
This PR fixes a bug with #7480. Where we used
addiinstead ofisubwhen either the LHS or RHS are constant. This is correct for the RHS rule, but not for LHS since the subtraction isn't commutative.