[clang-tools-extra] [clang-tidy] Fix a broken fix-it provided by `modernize-use-integer-sign-comparison` (PR #163488)

[Baranov Victor via cfe-commits]

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@@ -152,6 +152,8 @@ void UseIntegerSignComparisonCheck::check(
   if (const auto *RHSCast = llvm::dyn_cast<ExplicitCastExpr>(RHS)) {
     SubExprRHS = RHSCast->getSubExpr();
     R2.setEnd(SubExprRHS->getBeginLoc().getLocWithOffset(-1));
+    R3.setBegin(Lexer::getLocForEndOfToken(
+        SubExprRHS->getEndLoc(), 0, *Result.SourceManager, getLangOpts()));
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vbvictor wrote:

Wish we had meaningful names for R1, R2, R3. Could be a later NFC patch

https://github.com/llvm/llvm-project/pull/163488