[llvm] [VectorCombine] scalarizeLoadExtract - don't create scalar loads if any extract is waiting to be erased (PR #129375)

[Yingwei Zheng via llvm-commits]

================
@@ -24,3 +24,15 @@ define void @multiple_extract(ptr %p) {
   store i32 %e1, ptr %p1, align 4
   ret void
 }
+
+; infinite loop if we fold an extract that is waiting to be erased
+define void @unsued_extract(ptr %p) {
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dtcxzyw wrote:

```suggestion
define void @unused_extract(ptr %p) {
```

https://github.com/llvm/llvm-project/pull/129375