[llvm] [RISCV] Allow larger offset when matching build_vector as vid sequence (PR #144756)

[Craig Topper via llvm-commits]

================
@@ -3724,14 +3724,14 @@ static SDValue lowerBuildVectorViaVID(SDValue Op, SelectionDAG &DAG,
       SplatStepVal = Log2_64(std::abs(StepNumerator));
     }
 
-    // Only emit VIDs with suitably-small steps/addends. We use imm5 is a
-    // threshold since it's the immediate value many RVV instructions accept.
-    // There is no vmul.vi instruction so ensure multiply constant can fit in
-    // a single addi instruction.
+    // Only emit VIDs with suitably-small steps. We use imm5 is a threshold
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topperc wrote:

```suggestion
    // Only emit VIDs with suitably-small steps. We use imm5 as a threshold
```

https://github.com/llvm/llvm-project/pull/144756