[interpreter] Introduce bytecode generation pipeline.

test/cctest/interpreter/bytecode_expectations/ClassDeclarations.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: mixed
 execute: yes
 wrap: yes
 
 ---
@@ skipping 178 matching lines @@
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var count = 0;
   class C { constructor() { count++; }}
   return new C();
 "
-frame size: 10
+frame size: 7
 parameter count: 1
 bytecode array length: 74
 bytecodes: [
                 B(CallRuntime), U16(Runtime::kNewFunctionContext), R(closure), U8(1),
                 B(PushContext), R(2),
                 B(LdaTheHole),
                 B(Star), R(1),
   /*   30 E> */ B(StackCheck),
   /*   46 S> */ B(LdaZero),
   /*   46 E> */ B(StaContextSlot), R(context), U8(4),
@@ skipping 23 matching lines @@
   /*  103 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::SHARED_FUNCTION_INFO_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]