jscript: Emit undefined statement return for switch without default clausule.

dlls/jscript/compile.c

@@ -1515,8 +1515,11 @@ static HRESULT compile_switch_statement(compiler_ctx_t *ctx, switch_statement_t
         return hres;
     assert(i == case_cnt);
 
-    if(!have_default)
+    if(!have_default) {
         instr_ptr(ctx, default_jmp)->arg1.uint = ctx->code_off;
+        if(!push_instr(ctx, OP_undefined))
+            return E_OUTOFMEMORY;
+    }
 
     label_set_addr(ctx, stat_ctx.break_label);
     return S_OK;

dlls/jscript/tests/lang.js

@@ -719,6 +719,13 @@ case false:
 }
 ok(state === "default", "state = " + state);
 
+switch(1) {
+case 2:
+    ok(false, "unexpected case 2");
+case 3:
+    ok(false, "unexpected case 3");
+}
+
 tmp = eval("1");
 ok(tmp === 1, "eval(\"1\") !== 1");
 eval("{ ok(tmp === 1, 'eval: tmp !== 1'); } tmp = 2;");