[clang-tools-extra] [clang-tidy] `doesNotMutateObject`: Handle calls to member functions … (PR #94362)

[via cfe-commits]

================
@@ -36,6 +36,111 @@ void extractNodesByIdTo(ArrayRef<BoundNodes> Matches, StringRef ID,
     Nodes.insert(Match.getNodeAs<Node>(ID));
 }
 
+// If `D` has a const-qualified overload with otherwise identical
+// ref-qualifiers, returns that overload.
+const CXXMethodDecl *findConstOverload(const CXXMethodDecl &D) {
+  assert(!D.isConst());
+
+  DeclContext::lookup_result lookup_result =
+      D.getParent()->lookup(D.getNameInfo().getName());
+  if (lookup_result.isSingleResult()) {
+    // No overload.
+    return nullptr;
+  }
+  for (const Decl *overload : lookup_result) {
+    const CXXMethodDecl *candidate = dyn_cast<CXXMethodDecl>(overload);
----------------
EugeneZelenko wrote:

```suggestion
    const auto *candidate = dyn_cast<CXXMethodDecl>(overload);
```

Type is explicitly stated in same statement.

https://github.com/llvm/llvm-project/pull/94362