[clang] [clang-tools-extra] [clang-tidy] Warn about misuse of sizeof operator in loops. (PR #143205)

[Baranov Victor via cfe-commits]

================
@@ -353,6 +367,19 @@ void SizeofExpressionCheck::check(const MatchFinder::MatchResult &Result) {
     diag(E->getBeginLoc(),
          "suspicious usage of 'sizeof(char*)'; do you mean 'strlen'?")
         << E->getSourceRange();
+  } else if (const auto *E = Result.Nodes.getNodeAs<Stmt>("loop-expr")) {
+    auto *SizeofArgTy = Result.Nodes.getNodeAs<Type>("sizeof-arg-type");
+    if (const auto member = dyn_cast<MemberPointerType>(SizeofArgTy)) {
+      SizeofArgTy = member->getPointeeType().getTypePtr();
+    }
----------------
vbvictor wrote:

Please don't use braces for single-line ifs
```suggestion
    if (const auto member = dyn_cast<MemberPointerType>(SizeofArgTy))
      SizeofArgTy = member->getPointeeType().getTypePtr();
```

https://github.com/llvm/llvm-project/pull/143205