AK: Add a getter to JsonValue to get machine-native addresses

AK/JsonValue.h

@@ -91,6 +91,15 @@ public:
     u32 to_u32(u32 default_value = 0) const { return to_number<u32>(default_value); }
     u64 to_u64(u64 default_value = 0) const { return to_number<u64>(default_value); }
 
+    FlatPtr to_addr(FlatPtr default_value = 0) const
+    {
+#ifdef __LP64__
+        return to_u64(default_value);
+#else
+        return to_u32(default_value);
+#endif
+    }
+
     bool to_bool(bool default_value = false) const
     {
         if (!is_bool())

Userland/Libraries/LibSymbolication/Symbolication.cpp

@@ -108,7 +108,7 @@ Vector<Symbol> symbolicate_thread(pid_t pid, pid_t tid)
 
         stack.ensure_capacity(json.value().as_array().size());
         for (auto& value : json.value().as_array().values()) {
-            stack.append(value.to_u32());
+            stack.append(value.to_addr());
         }
     }
 
@@ -129,8 +129,8 @@ Vector<Symbol> symbolicate_thread(pid_t pid, pid_t tid)
         for (auto& region_value : json.value().as_array().values()) {
             auto& region = region_value.as_object();
             auto name = region.get("name").to_string();
-            auto address = region.get("address").to_u32();
-            auto size = region.get("size").to_u32();
+            auto address = region.get("address").to_addr();
+            auto size = region.get("size").to_addr();
 
             String path;
             if (name == "/usr/lib/Loader.so") {

Userland/Utilities/pmap.cpp

@@ -55,16 +55,12 @@ int main(int argc, char** argv)
 
     Vector<JsonValue> sorted_regions = json.value().as_array().values();
     quick_sort(sorted_regions, [](auto& a, auto& b) {
-        return a.as_object().get("address").to_u64() < b.as_object().get("address").to_u64();
+        return a.as_object().get("address").to_addr() < b.as_object().get("address").to_addr();
     });
 
     for (auto& value : sorted_regions) {
         auto& map = value.as_object();
-#if ARCH(I386)
-        auto address = map.get("address").to_u32();
-#else
-        auto address = map.get("address").to_u64();
-#endif
+        auto address = map.get("address").to_addr();
         auto size = map.get("size").to_string();
 
         auto access = String::formatted("{}{}{}{}{}",