[clang] [LifetimeSafety] Flow origins from lifetimebound args in `gsl::Pointer` construction (PR #189907)

[Gábor Horváth via cfe-commits]

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@@ -704,10 +704,10 @@ void FactsGenerator::handleFunctionCall(const Expr *Call,
         assert(!Args[I]->isGLValue() || ArgList->getLength() >= 2);
         ArgList = getRValueOrigins(Args[I], ArgList);
       }
-      if (isGslOwnerType(Args[I]->getType())) {
-        // The constructed gsl::Pointer borrows from the Owner's storage, not
-        // from what the Owner itself borrows, so only the outermost origin is
-        // needed.
+      if (isGslOwnerType(Args[I]->getType()) || IsArgLifetimeBound(I)) {
+        // The constructed gsl::Pointer is dependent on the argument itself, not
----------------
Xazax-hun wrote:

Another case that you could give a try to:
```
void test2() {
  Span<int**> s;
  int *p;
  int **pp;
  {
    int i;
    p = &I;
    pp = &p;
    s = Span(pp);
  }
  use(**s);
}
```

https://github.com/llvm/llvm-project/pull/189907