Merge kernel closure conversion into the Dart SDK

pkg/kernel/testcases/closures/catch.dart.expect

+library;
+import self as self;
+import "dart:core" as core;
+import "dart:mock" as mock;
+
+class Closure#main#function extends core::Object implements core::Function {
+  field core::String note = "This is temporary. The VM doesn't need closure classes.";
+  field mock::Context context;
+  constructor •(final mock::Context context) → dynamic
+    : self::Closure#main#function::context = context
+    ;
+  method call() → dynamic {
+    "This is a temporary solution. In the VM, this will become an additional parameter.";
+    final mock::Context #contextParameter = this.{self::Closure#main#function::context};
+    core::print(#contextParameter.[](0));
+    if(!#contextParameter.[](1).==(null))
+      core::print(#contextParameter.[](1));
+  }
+}
+static method main() → dynamic {
+  dynamic c;
+  try {
+    throw "Fisk";
+  }
+  on core::String catch(dynamic #t1, dynamic #t2) {
+    final mock::Context #context = new mock::Context::•(2);
+    #context.parent = null;
+    #context.[]=(0, #t1);
+    #context.[]=(1, #t2);
+    c = new self::Closure#main#function::•(#context);
+  }
+  c.call();
+  core::print("TEST PASSED");
+}