Add primitive to create closures and use it for closure conversion

pkg/kernel/binary.md

Index: pkg/kernel/binary.md
diff --git a/pkg/kernel/binary.md b/pkg/kernel/binary.md
index bd89d60413832f382e1fb8b7d939cc2103a349da..aae1e3008d2e4707f340c23737a3355a52f7ca1d 100644
--- a/pkg/kernel/binary.md
+++ b/pkg/kernel/binary.md
@@ -681,6 +681,13 @@ type VectorCopy extends Expression {
   Expression vectorExpression;
 }
 
+type ClosureCreation extends Expression {
+  Byte tag = 106;
+  MemberReference topLevelFunctionReference;
+  Expression contextVector;
+  FunctionType functionType;
+}
+
 abstract type Statement extends Node {}
 
 type InvalidStatement extends Statement {