remove unnecessary ud2 instructions

src/syscalls.zig

@@ -74,12 +74,10 @@ export fn syscall_handler(ctx: *SavedContext) callconv(.c) void {
             asm volatile (
                 \\ mov %[rsp], %%rsp
                 \\ syscall
-                \\ ud2
                 :
                 : [rsp] "r" (rsp_orig),
                   [number] "{rax}" (ctx.rax),
-                : .{ .memory = true }
-            );
+                : .{ .memory = true });
             unreachable;
         },
         .execve, .execveat => |s| {

src/test/clone_no_new_stack.zig

@@ -30,9 +30,6 @@ pub fn main() !void {
         \\ mov $60, %%rax       # SYS_exit
         \\ syscall
         \\
-        \\ # Should not be reached
-        \\ ud2
-        \\
         \\ 1:
         \\ # Parent Path continues
         : [ret] "={rax}" (-> usize),

src/test/clone_raw.zig

@@ -34,9 +34,6 @@ pub fn main() !void {
         \\ mov $60, %%rax       # SYS_exit
         \\ syscall
         \\
-        \\ # Should not be reached
-        \\ ud2
-        \\
         \\ 1:
         \\ # Parent Path continues
         : [ret] "={rax}" (-> usize),