[Interpreter] Refactor bytecode generator test suite.

test/cctest/interpreter/WithStatement.golden

+#
+# Autogenerated by generate-bytecode-expectations
+#
+
+---
+pool type: mixed
+execute: yes
+wrap: yes
+
+---
+snippet: "
+  with ({x:42}) { return x; }
+"
+frame size: 5  # in multiples of sizeof(void*)
+parameter count: 1
+bytecodes: [
+  B(CallRuntime), U16(461), R(closure), U8(1),
+  B(PushContext), R(0),
+  B(Ldar), R(this),
+  B(StaContextSlot), R(context), U8(4),
+  B(CreateMappedArguments),
+  B(StaContextSlot), R(context), U8(5),
+  B(Ldar), R(new_target),
+  B(StaContextSlot), R(context), U8(6),
+  B(StackCheck),
+  B(CreateObjectLiteral), U8(0), U8(0), U8(9),
+  B(Star), R(2),
+  B(ToObject),
+  B(Star), R(3),
+  B(Ldar), R(closure),
+  B(Star), R(4),
+  B(CallRuntime), U16(462), R(3), U8(2),
+  B(PushContext), R(1),
+  B(LdaLookupSlot), U8(1),
+  B(PopContext), R(0),
+  B(Return),
+]
+constant pool: [
+  InstanceType::FIXED_ARRAY_TYPE,
+  InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
+]
+handlers: [
+]
+