[interpreter] Introduce bytecode generation pipeline.

test/cctest/interpreter/bytecode_expectations/DoExpression.golden

Index: test/cctest/interpreter/bytecode_expectations/DoExpression.golden
diff --git a/test/cctest/interpreter/bytecode_expectations/DoExpression.golden b/test/cctest/interpreter/bytecode_expectations/DoExpression.golden
index 91da83b64069c8ffb15c3f5f7778f17e3e736bb3..3ac8b4bc6b72485d362f8dd2540ddf6d7d7cbd61 100644
--- a/test/cctest/interpreter/bytecode_expectations/DoExpression.golden
+++ b/test/cctest/interpreter/bytecode_expectations/DoExpression.golden
@@ -14,11 +14,12 @@ snippet: "
 "
 frame size: 2
 parameter count: 1
-bytecode array length: 6
+bytecode array length: 7
 bytecodes: [
   B(StackCheck),
   B(Ldar), R(0),
   B(Star), R(1),
+  B(Nop),
   B(Return),
 ]
 constant pool: [
@@ -32,7 +33,7 @@ snippet: "
 "
 frame size: 3
 parameter count: 1
-bytecode array length: 11
+bytecode array length: 12
 bytecodes: [
   B(StackCheck),
   B(LdaSmi), U8(100),
@@ -40,6 +41,7 @@ bytecodes: [
   B(LdaUndefined),
   B(Star), R(0),
   B(Star), R(2),
+  B(Nop),
   B(Return),
 ]
 constant pool: [