[clang] [Clang][counted_by] Use the expr's RecordDecl if available (PR #205903)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp -- clang/test/CodeGen/attr-counted-by-nested-structs.c clang/lib/CodeGen/CGExpr.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index e53b4be55..57cab39c1 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -1064,8 +1064,7 @@ namespace {
 /// or through a chain of nested record fields (including anonymous
 /// structs/unions). This mirrors the GEP path that getGEPIndicesToField builds,
 /// and is used to identify the right anchor expression in Base.
-static bool recordContainsField(const RecordDecl *RD,
-                                const FieldDecl *Field) {
+static bool recordContainsField(const RecordDecl *RD, const FieldDecl *Field) {
   for (const FieldDecl *FD : RD->fields()) {
     if (FD == Field)
       return true;

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https://github.com/llvm/llvm-project/pull/205903