Add a core test mode for MODULARIZE=instance (#24298)

Author: sbc100

.circleci/config.yml

@@ -802,6 +802,7 @@ jobs:
             core0.test_async_ccall_promise_jspi*
             core0.test_cubescript_jspi
             esm_integration.test_fs_js_api*
+            instance.test_hello_world
             "
       # Run some basic tests with the minimum version of node that we currently
       # support in the generated code.

test/runner.py

@@ -72,6 +72,7 @@
   'wasm64_v8',
   'wasm64_4gb',
   'esm_integration',
+  'instance',
 ]
 
 # The default core test mode, used when none is specified

test/test_core.py

@@ -9786,6 +9786,7 @@ def setUp(self):
                   init=lambda self: shared.node_bigint_flags(self.get_nodejs()))
 
 esm_integration = make_run('esm_integration', init=lambda self: self.setup_esm_integration())
+instance = make_run('instance', emcc_args=['-Wno-experimental'], settings={'MODULARIZE': 'instance'})
 
 # Add DEFAULT_TO_CXX=0
 strict = make_run('strict', emcc_args=[], settings={'STRICT': 1})