[llvm] [SLP] NFC. Use Value instead of template. (PR #115440)

[Han-Kuan Chen via llvm-commits]

================
@@ -239,7 +239,7 @@ static bool isValidElementType(Type *Ty) {
 /// returns the type of its value operand, for Cmp - the types of the compare
 /// operands and for insertelement - the type os the inserted operand.
 /// Otherwise, just the type of the value is returned.
-template <typename T> static Type *getValueType(T *V) {
+static Type *getValueType(Value *V) {
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HanKuanChen wrote:

I think it cannot analyze in compilation phase.
We pass `Value *` for the most of `getValueType` usage.
Only here is `Instruction *`
```
  for (Instruction *V : CmpInsts)
    if (!R.isDeleted(V) && isValidElementType(getValueType(V)))
      Vals.push_back(V);
```

https://github.com/llvm/llvm-project/pull/115440