AK: Add Variant::unsafe_get()

This performs no validation and no verifications on release.
only useful when you've already verified the type by external means.

Author: alimpfard

AK/Variant.h

@@ -355,6 +355,14 @@ struct Variant
         return nullptr;
     }
 
+    template<typename T>
+    T& unsafe_get()
+    requires(can_contain<T>())
+    {
+        ASSERT(has<T>());
+        return *bit_cast<T*>(&m_data);
+    }
+
     template<typename T>
     T& get()
     requires(can_contain<T>())
@@ -380,6 +388,14 @@ struct Variant
         return *bit_cast<T const*>(&m_data);
     }
 
+    template<typename T>
+    T const& unsafe_get() const
+    requires(can_contain<T>())
+    {
+        ASSERT(has<T>());
+        return *bit_cast<T const*>(&m_data);
+    }
+
     template<typename T>
     [[nodiscard]] bool has() const
     requires(can_contain<T>())