Merge kernel closure conversion into the Dart SDK

pkg/kernel/testcases/closures/non_void_context.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 x) → 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};
+    return self::v = let final dynamic #t1 = #contextParameter in let final dynamic #t2 = 0 in let final dynamic #t3 = x in let final dynamic #t4 = #t1.[]=(#t2, #t3) in #t3;
+  }
+}
+class Closure#main#function#1 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#1::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#1::context};
+    for (; let final dynamic #t5 = #contextParameter in let final dynamic #t6 = 0 in let final dynamic #t7 = self::v in let final dynamic #t8 = #t5.[]=(#t6, #t7) in #t7; ) {
+      self::v = false;
+    }
+  }
+}
+static field dynamic v = null;
+static method main(dynamic arguments) → dynamic {
+  final mock::Context #context = new mock::Context::•(1);
+  #context.parent = null;
+  #context.[]=(0, null);
+  new self::Closure#main#function::•(#context).call(87);
+  if(!self::v.==(87)) {
+    throw "Unexpected value in v: ${self::v}";
+  }
+  if(!#context.[](0).==(87)) {
+    throw "Unexpected value in w: ${#context.[](0)}";
+  }
+  self::v = true;
+  new self::Closure#main#function#1::•(#context).call();
+  if(!self::v.==(false)) {
+    throw "Unexpected value in v: ${self::v}";
+  }
+  if(!#context.[](0).==(false)) {
+    throw "Unexpected value in w: ${#context.[](0)}";
+  }
+}