[clang] [clang][NFC] Fix the static assertion in 4797437 (PR #120643)

[Jon Roelofs via cfe-commits]

================
@@ -114,10 +114,9 @@ class alignas(void *) Stmt {
 #define STMT(CLASS, PARENT)
 #define STMT_RANGE(BASE, FIRST, LAST)
 #define LAST_STMT_RANGE(BASE, FIRST, LAST)                                     \
-  static_assert(                                                               \
-      llvm::isInt<NumStmtBits>(StmtClass::LAST##Class),                        \
-      "The number of 'StmtClass'es is strictly bounded under two to "          \
-      "the power of 'NumStmtBits'");
+  static_assert(llvm::isUint<NumStmtBits>(                                     \
----------------
jroelofs wrote:

```suggestion
  static_assert(llvm::isUInt<NumStmtBits>(                                     \
```

https://github.com/llvm/llvm-project/pull/120643