[interpreter] Add CreateFunctionContext bytecode

src/interpreter/bytecode-array-builder.cc

Index: src/interpreter/bytecode-array-builder.cc
diff --git a/src/interpreter/bytecode-array-builder.cc b/src/interpreter/bytecode-array-builder.cc
index b205c32b0f37010e21ad06d733269c338b136e82..16ae572e320942603e7c9e5ebd85c034811ae29e 100644
--- a/src/interpreter/bytecode-array-builder.cc
+++ b/src/interpreter/bytecode-array-builder.cc
@@ -337,6 +337,11 @@ BytecodeArrayBuilder& BytecodeArrayBuilder::CreateClosure(
   return *this;
 }
 
+BytecodeArrayBuilder& BytecodeArrayBuilder::CreateFunctionContext(int slots) {
+  Output(Bytecode::kCreateFunctionContext, UnsignedOperand(slots));
+  return *this;
+}
+
 BytecodeArrayBuilder& BytecodeArrayBuilder::CreateArguments(
     CreateArgumentsType type) {
   // TODO(rmcilroy): Consider passing the type as a bytecode operand rather