[clang] [clang][dataflow] Expose simple access to child StorageLocation presence. (PR #145520)

[Samira Bakon via cfe-commits]

https://github.com/bazuzi created https://github.com/llvm/llvm-project/pull/145520

`getChild` does not offer this knowledge, and a map lookup is significantly cheaper than iteration over `children()`.

>From 9b8f866a5102dbe23b671760bf35549b30a30a74 Mon Sep 17 00:00:00 2001
From: Samira Bakon <bazuzi at google.com>
Date: Tue, 24 Jun 2025 10:23:11 -0400
Subject: [PATCH] [clang][dataflow] Expose simple access to whether a child
 StorageLocation is present.

`getChild` does not offer this knowledge, and a map lookup is significantly cheaper than iteration over `children()`.
---
 clang/include/clang/Analysis/FlowSensitive/StorageLocation.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/clang/include/clang/Analysis/FlowSensitive/StorageLocation.h b/clang/include/clang/Analysis/FlowSensitive/StorageLocation.h
index 8fcc6a44027a0..8b263b16d5b1e 100644
--- a/clang/include/clang/Analysis/FlowSensitive/StorageLocation.h
+++ b/clang/include/clang/Analysis/FlowSensitive/StorageLocation.h
@@ -168,6 +168,8 @@ class RecordStorageLocation final : public StorageLocation {
     return {Children.begin(), Children.end()};
   }
 
+  bool hasChild(const ValueDecl &D) const { return Children.contains(&D); }
+
 private:
   FieldToLoc Children;
   SyntheticFieldMap SyntheticFields;