[clang] [LifetimeSafety] Add missing origins stats for lifetime analysis (PR #166568)

[Utkarsh Saxena via cfe-commits]

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@@ -37,6 +44,17 @@ OriginID OriginManager::get(const Expr &E) {
   auto It = ExprToOriginID.find(&E);
   if (It != ExprToOriginID.end())
     return It->second;
+
+  // if the expression has no specific origin, increment the missing origin
+  // counter.
+  std::string ExprStr(E.getStmtClassName());
+  ExprStr = ExprStr + "<" + E.getType().getAsString() + ">";
+  auto CountIt = ExprTypeToMissingOriginCount.find(ExprStr);
+  if (CountIt == ExprTypeToMissingOriginCount.end()) {
+    ExprTypeToMissingOriginCount[ExprStr] = 1;
+  } else {
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usx95 wrote:

nit: https://llvm.org/docs/CodingStandards.html#don-t-use-braces-on-simple-single-statement-bodies-of-if-else-loop-statements

https://github.com/llvm/llvm-project/pull/166568