use trampoline to aign stack for call to rust panic

lang/src/lib.asm

@@ -31,8 +31,6 @@ global is_whitespace
 global is_id_continue
 global is_id_start
 
-extern panic
-
 ;; ==============================
 ;; Helper functions
 ;; ==============================
@@ -446,3 +444,8 @@ is_whitespace:
     mov rax, 1
     ret
     
+extern panic_impl
+global panic
+panic:
+    and rsp, -16
+    call panic_impl

lang/tests/shared/shared.rs

@@ -9,7 +9,7 @@ fn __do_panic() -> ! {
 }
 
 #[unsafe(no_mangle)]
-extern "C" fn panic() -> ! {
+extern "C" fn panic_impl() -> ! {
     __do_panic()
 }