Implement assert in initializer list in VM.

tests/language/language.status

Index: tests/language/language.status
diff --git a/tests/language/language.status b/tests/language/language.status
index b427eff611d197ff94e50cb1567263dd8c85d5b3..e6bcf4546642fa6af5dea29d784c7e6de9c8975d 100644
--- a/tests/language/language.status
+++ b/tests/language/language.status
@@ -252,3 +252,15 @@ issue23244_test: Skip # Issue #26373
 deferred_load_inval_code_test: RuntimeError
 regress_26453_test: Pass, Fail, Crash
 vm/regress_16873_test: Pass, Crash
+
+[$runtime != vm || $compiler != none]
+assert_initializer_test: SKIP  # not implemented yet, experiment is VM only.
+
+[$runtime == vm && $compiler == none && $unchecked]
+assert_initializer_test/*: MissingCompileTimeError, OK  # asserts shouldn't fail in unchecked mode.
+assert_initializer_test/none: pass
+
+[$runtime == vm && $compiler == none && $checked]
+// The VM doesn't enforce that potentially const expressions are actually
+// const expressions when the constructor is called with `const`.
+assert_initializer_test/4*: MissingCompileTimeError # Issue 392.