[clang] [clang] Fix dangling false positives for conditional operators. (PR #120233)

[Haojian Wu via cfe-commits]

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@@ -582,6 +582,15 @@ static void visitFunctionCallArguments(IndirectLocalPath &Path, Expr *Call,
     //   Temp().ptr; // Here ptr might not dangle.
     if (isa<MemberExpr>(Arg->IgnoreImpCasts()))
       return;
+    // Avoid false positives when the object is constructed from a conditional
+    // operator argument. A common case is:
+    //   // 'ptr' might not be owned by the Owner object.
+    //   std::string_view s = cond() ? Owner().ptr : sv;
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hokein wrote:

note: I keep the code simple here, and heuristic logic is not perfect and may lead to false negatives, as it filters out more cases than intended. The major case `std::string_view sv = cond ? "123" : std::string();` is still covered, I think this is a right tradeoff.

https://github.com/llvm/llvm-project/pull/120233