[llvm] [RISCV][ISel] Eliminate `andi rd, rs1, -1` instructions (PR #89976)

[Craig Topper via llvm-commits]

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@@ -864,7 +864,6 @@ define i64 @zext_mul12884901888(i32 signext %a) {
 ;
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topperc wrote:

Remove FIXME above this function

https://github.com/llvm/llvm-project/pull/89976