[mlir] Use reinterpret cast to construct TypedValue from a pointer

[ezhulenev]

Summary

Value is not convertible to TypedValue<T>, use explicit constructor from a pointer

[ezhulenev]

Rebased

[ezhulenev]

Rebased

mlir/include/mlir/IR/Value.h

static mlir::OpResult getTombstoneKey() {
     return reinterpret_cast<mlir::detail::OpResultImpl *>(pointer);
   }
 };
 template <typename T>
 struct DenseMapInfo<mlir::detail::TypedValue<T>>
     : public DenseMapInfo<mlir::Value> {
   static mlir::detail::TypedValue<T> getEmptyKey() {
     void *pointer = llvm::DenseMapInfo<void *>::getEmptyKey();
-    return mlir::Value::getFromOpaquePointer(pointer);
+    return reinterpret_cast<mlir::detail::ValueImpl *>(pointer);
   }
   static mlir::detail::TypedValue<T> getTombstoneKey() {
     void *pointer = llvm::DenseMapInfo<void *>::getTombstoneKey();
-    return mlir::Value::getFromOpaquePointer(pointer);
+    return reinterpret_cast<mlir::detail::ValueImpl *>(pointer);
   }
 };
 
 /// Allow stealing the low bits of a value.
 template <>
 struct PointerLikeTypeTraits<mlir::Value> {
 public:
   static inline void *getAsVoidPointer(mlir::Value value) {
static inline mlir::OpResult getFromVoidPointer(void *pointer) {
     return reinterpret_cast<mlir::detail::OpResultImpl *>(pointer);
   }
 };
 template <typename T>
 struct PointerLikeTypeTraits<mlir::detail::TypedValue<T>>
     : public PointerLikeTypeTraits<mlir::Value> {
 public:
   static inline mlir::detail::TypedValue<T> getFromVoidPointer(void *pointer) {
-    return mlir::Value::getFromOpaquePointer(pointer);
+    return reinterpret_cast<mlir::detail::ValueImpl *>(pointer);
   }
 };
 
 /// Add support for llvm style casts. We provide a cast between To and From if
 /// From is mlir::Value or derives from it.
 template <typename To, typename From>
 struct CastInfo<
     To, From,