[llvm] [CostModel] Remove some negative costs. (PR #135533)

[Simon Pilgrim via llvm-commits]

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@@ -755,8 +755,9 @@ class TargetTransformInfoImplBase {
     // Note: The `insertvalue` cost here is chosen to match the default case of
     // getInstructionCost() -- as pior to adding this helper `insertvalue` was
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RKSimon wrote:

pior -> prior

https://github.com/llvm/llvm-project/pull/135533