[clang] [Clang] Fixed an assertion failure in constant evaluation/AST parsing when encountering malformed struct and enum declarations with missing closing braces (PR #200214)

[Chen Miao via cfe-commits]

================
@@ -18903,6 +18903,10 @@ Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind 
TUK, SourceLocation KWLoc,
     } else
       New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
                                cast_or_null<RecordDecl>(PrevDecl));
+
+    // Impossible to decl struct/union/class in enum
+    if (isa<EnumDecl>(SearchDC))
+      Invalid = true;
----------------
ChenMiaoi wrote:

Would setting `Invalid = true` here be too broad? It seems to introduce new 
issues, for example:

``` cc
enum E { 
    A = sizeof(struct { int x; }) 
};
```

It seems skip some checks.

https://github.com/llvm/llvm-project/pull/200214
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