[llvm] [ADT] DenseMapInfo<unsigned long>::getHashValue - avoid MSVC out of bounds shift warning (PR #96173)

[Nikita Popov via llvm-commits]

================
@@ -142,7 +142,7 @@ template<> struct DenseMapInfo<unsigned long> {
     if constexpr (sizeof(Val) == 4)
       return DenseMapInfo<unsigned>::getHashValue(Val);
     else
-      return detail::combineHashValue(Val >> 32, Val);
+      return detail::combineHashValue(Val >> (4 * sizeof(Val)), Val);
----------------
nikic wrote:

```suggestion
      return densemap::detail::mix(Val);
```
to avoid the issue entirely?

https://github.com/llvm/llvm-project/pull/96173