Addd stack_save, stack_restore and set_threw for longjmp

lib/emscripten/src/jmp.rs

@@ -37,6 +37,18 @@ pub fn __longjmp(ctx: &mut Ctx, env_addr: u32, val: c_int) {
     };
 }
 
+/// _longjmp
+pub fn _longjmp(ctx: &mut Ctx, env_addr: i32, val: c_int) {
+    let val = if val == 0 {
+        1
+    } else {
+        val
+    };
+    get_emscripten_data(ctx).set_threw.as_ref().expect("set_threw is None").call(env_addr, val).expect("set_threw failed to call");
+    panic!("longjmp");
+}
+
+
 extern "C" {
     fn setjmp(env: *mut c_void) -> c_int;
     fn longjmp(env: *mut c_void, val: c_int) -> !;