[clang] Thread Safety Analysis: Support reentrant capabilities (PR #137133)

[Aaron Puchert via cfe-commits]

================
@@ -168,6 +197,8 @@ class FactManager {
 public:
   FactID newFact(std::unique_ptr<FactEntry> Entry) {
     Facts.push_back(std::move(Entry));
+    assert(Facts.size() - 1 <= std::numeric_limits<unsigned short>::max() &&
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aaronpuchert wrote:

```suggestion
    assert(Facts.size() - 1 <= std::numeric_limits<FactID>::max() &&
```

https://github.com/llvm/llvm-project/pull/137133