The _code field in an NSError is signed, not unsigned. (#119764)

The NSError summary provider was fetching and printing the `_code` field
as an unsigned integer, but it's defined to be an NSInteger, which is
signed.

Author: jimingham

lldb/source/Plugins/Language/ObjC/NSError.cpp

@@ -66,8 +66,8 @@ bool lldb_private::formatters::NSError_SummaryProvider(
   lldb::addr_t domain_location = ptr_value + 3 * ptr_size;
 
   Status error;
-  uint64_t code = process_sp->ReadUnsignedIntegerFromMemory(code_location,
-                                                            ptr_size, 0, error);
+  int64_t code = process_sp->ReadSignedIntegerFromMemory(code_location,
+                                                         ptr_size, 0, error);
   if (error.Fail())
     return false;
 
@@ -77,7 +77,7 @@ bool lldb_private::formatters::NSError_SummaryProvider(
     return false;
 
   if (!domain_str_value) {
-    stream.Printf("domain: nil - code: %" PRIu64, code);
+    stream.Printf("domain: nil - code: %" PRIi64, code);
     return true;
   }
 
@@ -98,11 +98,11 @@ bool lldb_private::formatters::NSError_SummaryProvider(
   StreamString domain_str_summary;
   if (NSStringSummaryProvider(*domain_str_sp, domain_str_summary, options) &&
       !domain_str_summary.Empty()) {
-    stream.Printf("domain: %s - code: %" PRIu64, domain_str_summary.GetData(),
+    stream.Printf("domain: %s - code: %" PRIi64, domain_str_summary.GetData(),
                   code);
     return true;
   } else {
-    stream.Printf("domain: nil - code: %" PRIu64, code);
+    stream.Printf("domain: nil - code: %" PRIi64, code);
     return true;
   }
 }

lldb/test/API/functionalities/data-formatter/data-formatter-objc/TestDataFormatterObjCNSError.py

@@ -23,10 +23,12 @@ def test_nserror_with_run_command_no_const(self):
         self.appkit_tester_impl(self.nserror_data_formatter_commands, False)
 
     def nserror_data_formatter_commands(self):
-        self.expect("frame variable nserror", substrs=['domain: @"Foobar" - code: 12'])
+        self.expect(
+            "frame variable nserror", substrs=['domain: @"Foobar" - code: -1234']
+        )
 
         self.expect(
-            "frame variable nserrorptr", substrs=['domain: @"Foobar" - code: 12']
+            "frame variable nserrorptr", substrs=['domain: @"Foobar" - code: -1234']
         )
 
         self.expect("frame variable nserror->_userInfo", substrs=["2 key/value pairs"])

lldb/test/API/functionalities/data-formatter/data-formatter-objc/main.m

@@ -618,7 +618,7 @@ int main(int argc, const char *argv[]) {
 
   NSDictionary *error_userInfo = @{@"a" : @1, @"b" : @2};
   NSError *nserror = [[NSError alloc] initWithDomain:@"Foobar"
-                                                code:12
+                                                code:-1234
                                             userInfo:error_userInfo];
   NSError **nserrorptr = &nserror;