[clang-tools-extra] [clang-tidy] Enhance modernize-use-starts-ends-with to handle substr patterns (PR #116033)

[Nicolas van Kempen via cfe-commits]

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@@ -71,6 +71,17 @@ struct NotLengthExprForStringNode {
   ASTContext *Context;
 };
 
+static bool isNegativeComparison(const Expr *ComparisonExpr) {
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nicovank wrote:

Nit: place above `NotLengthExprForStringNode` so `lengthExprForStringNode` and `NotLengthExprForStringNode` stay grouped.

https://github.com/llvm/llvm-project/pull/116033