Increase default stack size of parse_sv

sv-parser/examples/parse_sv.rs

@@ -55,6 +55,10 @@ fn main() {
         defines.insert(ident, Some(define));
     }
 
+    let builder = std::thread::Builder::new().stack_size(20 * 1024 * 1024);
+
+    let child = builder
+        .spawn(move || {
             let mut exit = 0;
             for path in &opt.files {
                 if opt.pp {
@@ -97,6 +101,10 @@ fn main() {
                 }
             }
             process::exit(exit);
+        })
+        .expect("thread spawn failure");
+
+    let _ = child.join();
 }
 
 static CHAR_CR: u8 = 0x0d;