[clang] [analyzer] Revert incorrect LazyCoumpoundVal changes (PR #163461)

[Marco Borgeaud via cfe-commits]

================
@@ -503,3 +503,75 @@ namespace optional_union {
     custom_union_t a;
   } // leak-warning{{Potential leak of memory pointed to by 'a.present.q'}}
 }
+
+namespace gh153782 {
+
+// Ensure we do not regress on the following use case.
+
+namespace mutually_exclusive_test_case_1 {
+struct StorageWrapper {
+  // Imagine those two call a reset() function (among other things)
+  ~StorageWrapper() { delete parts; }
+  StorageWrapper(StorageWrapper const&) = default;
+
+  // Mind that there is no assignment here -- this is the bug we would like to find.
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marco-antognini-sonarsource wrote:

I realise it was not obvious at all -- I've rephrase it.

The intend was to say, there is no `parts = other.parts;` after the `delete`.

Let me know if this is clearer now after 904f919f22f2d2b7177c86ebbeafd46ddf36e234

https://github.com/llvm/llvm-project/pull/163461