Update log_on_line to take Location* instead of individual fields

v0/test_log.c

@@ -21,10 +21,18 @@ static void test_log_error(void) {
 }
 
 static void test_log_on_line(void) {
-    log_on_line("test.c", "int main() []", 1, 12, 13, "unexpected token");
+    Location loc = {
+        .filename = "test.c",
+        .line_text = "int main() []",
+        .line_text_length = 13,
+        .line = 1,
+        .column = 12
+    };
+
+    log_on_line(&loc, 13, "unexpected token");
     assert_log_file("v0/tests/log_on_line.txt", "expected formatted error message");
 
     log_clear();
-    log_on_line("test.c", "int main() []", 1, 12, 13, "unexpected token '%c'", 'x');
+    log_on_line(&loc, 13, "unexpected token '%c'", 'x');
     assert_log_file("v0/tests/log_on_line_variadic.txt", "expected formatted error message with variadic args");
 }