[clang] [Thread Safety Analysis] Fix a bug of context saving in alias-analysis (PR #178825)

[Marco Elver via cfe-commits]

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@@ -7675,4 +7675,25 @@ void testLoopConditionalReassignment(Foo *f1, Foo *f2, bool cond) {
   f1->data = 42;
   ptr->mu.Unlock(); // expected-warning{{releasing mutex 'ptr->mu' that was not held}}
 } // expected-warning{{mutex 'f1->mu' is still held at the end of function}}
+  
+
+void unlock_Foo(Foo **Fp) __attribute__((release_capability((*Fp)->mu)));
+// A function that may do anything to the objects referred to by the inputs:
+void f(void *, void *, void *);
+
+void saveContexBug(Foo *F)
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melver wrote:

Not a bug if we fixed it, so just call it e.g. `testPointerAliasEscapeMultiple`.

Also use a consistent style, i.e.:
```
void testPointerAliasEscapeMultiple(...) {
```

https://github.com/llvm/llvm-project/pull/178825