[clang] [clang] Implement lifetime analysis for lifetime_capture_by(X) (PR #115921)

[Boaz Brickner via cfe-commits]

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@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -Wdangling -Wdangling-field -Wreturn-stack-address -verify %s
+// RUN: %clang_cc1 --std=c++20 -fsyntax-only -Wdangling -Wdangling-field -Wreturn-stack-address -verify %s
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bricknerb wrote:

Should we limit all the tests here to C++20?

https://github.com/llvm/llvm-project/pull/115921