fix #30094, assert should work with a function

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart

Index: pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
index 835ead6f55a006461877ef6cb31680a4c128fc5c..c7a5d0d963c5ae8844b203e4e63d1d3d67a4ec7b 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
@@ -701,11 +701,9 @@ map(values, [K, V]) => JS(
 })()''');
 
 @JSExportName('assert')
-assert_(condition, [message]) => JS(
-    '',
-    '''(() => {
-  if (!$condition) $throwAssertionError(message);
-})()''');
+assert_(condition, message) {
+  if (JS('bool', '!#', condition)) throwAssertionError(message);

[vsm, 2017/07/07 12:38:47]

If the static type of condition is `dynamic`, we would need to test for a
function at runtime, right?

+}
 
 /// Store a JS error for an exception.  For non-primitives, we store as an
 /// expando.  For primitive, we use a side cache.  To limit memory leakage, we