[clang] [clang][Diagnostics] Highlight code snippets (PR #66514)

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@@ -878,6 +878,25 @@ bool Preprocessor::HandleIdentifier(Token &Identifier) {
   return true;
 }
 
+void Preprocessor::saveCheckPoint(const char *P) {
+  static constexpr ptrdiff_t Limit = 1024 * 8;
+  if (CheckPoints.empty()) {
+    CheckPoints.push_back(P);
+    return;
+  }
+
+  const char *Cur = CheckPoints.back();
+  if (Cur == P)
+    return;
+  if ((P - Cur) > Limit)
+    CheckPoints.push_back(P);
+}
+
+const char *Preprocessor::getSaveFor(const char *S) const {
----------------
cor3ntin wrote:

Can you use consistent names? Maybe get/setCompleteTokenCheckpoint? We might 
want a small documentation comment too

https://github.com/llvm/llvm-project/pull/66514
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