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

[Boaz Brickner via cfe-commits]

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@@ -793,3 +806,202 @@ void test13() {
 }
 
 } // namespace GH100526
+
+namespace lifetime_capture_by {
+struct X {
+  const int *x;
+  void captureInt(const int& x [[clang::lifetime_capture_by(this)]]) { this->x = &x; }
+  void captureSV(std::string_view sv [[clang::lifetime_capture_by(this)]]);
+};
+///////////////////////////
+// Detect dangling cases.
+///////////////////////////
+void captureInt(const int& i [[clang::lifetime_capture_by(x)]], X& x);
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bricknerb wrote:

We typically put the space before the '&', like in line 732 or other places.

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