[llvm] [NFC][LLVM] Document and adopt variadic `isa` in a few places (PR #136869)

[Jakub Kuderski via llvm-commits]

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@@ -39,9 +39,8 @@ Value *llvm::getDefaultValue(Type *T) {
 }
 
 bool llvm::hasAliasUse(Function &F) {
-  return any_of(F.users(), [](User *U) {
-      return isa<GlobalAlias>(U) || isa<GlobalIFunc>(U);
-    });
+  return any_of(F.users(),
+                [](User *U) { return isa<GlobalAlias, GlobalIFunc>(U); });
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kuhar wrote:

You can also do
```suggestion
  return any_of(F.users(), llvm::IsaPred<GlobalAlias, GlobalIFunc>);
```

https://github.com/llvm/llvm-project/pull/136869