[Interpreter] Refactor bytecode generator test suite.

test/cctest/interpreter/bytecode_expectations/LetVariable.golden

Index: test/cctest/interpreter/bytecode_expectations/LetVariable.golden
diff --git a/test/cctest/interpreter/bytecode_expectations/LetVariable.golden b/test/cctest/interpreter/bytecode_expectations/LetVariable.golden
new file mode 100644
index 0000000000000000000000000000000000000000..b942e9aefe40f0864ff39d60cf97f9647c27992e
--- /dev/null
+++ b/test/cctest/interpreter/bytecode_expectations/LetVariable.golden
@@ -0,0 +1,115 @@
+#
+# Autogenerated by generate-bytecode-expectations.
+#
+
+---
+pool type: string
+execute: yes
+wrap: yes
+
+---
+snippet: "
+  let x = 10;
+"
+frame size: 1
+parameter count: 1
+bytecode array length: 10
+bytecodes: [
+  B(LdaTheHole),
+  B(Star), R(0),
+  B(StackCheck),
+  B(LdaSmi8), U8(10),
+  B(Star), R(0),
+  B(LdaUndefined),
+  B(Return),
+]
+constant pool: [
+]
+handlers: [
+]
+
+---
+snippet: "
+  let x = 10; return x;
+"
+frame size: 2
+parameter count: 1
+bytecode array length: 20
+bytecodes: [
+  B(LdaTheHole),
+  B(Star), R(0),
+  B(StackCheck),
+  B(LdaSmi8), U8(10),
+  B(Star), R(0),
+  B(JumpIfNotHole), U8(11),
+  B(LdaConstant), U8(0),
+  B(Star), R(1),
+  B(CallRuntime), U16(Runtime::kThrowReferenceError), R(1), U8(1),
+  B(Return),
+]
+constant pool: [
+  "x",
+]
+handlers: [
+]
+
+---
+snippet: "
+  let x = (x = 20);
+"
+frame size: 3
+parameter count: 1
+bytecode array length: 27
+bytecodes: [
+  B(LdaTheHole),
+  B(Star), R(0),
+  B(StackCheck),
+  B(LdaSmi8), U8(20),
+  B(Star), R(1),
+  B(Ldar), R(0),
+  B(JumpIfNotHole), U8(11),
+  B(LdaConstant), U8(0),
+  B(Star), R(2),
+  B(CallRuntime), U16(Runtime::kThrowReferenceError), R(2), U8(1),
+  B(Ldar), R(1),
+  B(Star), R(0),
+  B(LdaUndefined),
+  B(Return),
+]
+constant pool: [
+  "x",
+]
+handlers: [
+]
+
+---
+snippet: "
+  let x = 10; x = 20;
+"
+frame size: 3
+parameter count: 1
+bytecode array length: 31
+bytecodes: [
+  B(LdaTheHole),
+  B(Star), R(0),
+  B(StackCheck),
+  B(LdaSmi8), U8(10),
+  B(Star), R(0),
+  B(LdaSmi8), U8(20),
+  B(Star), R(1),
+  B(Ldar), R(0),
+  B(JumpIfNotHole), U8(11),
+  B(LdaConstant), U8(0),
+  B(Star), R(2),
+  B(CallRuntime), U16(Runtime::kThrowReferenceError), R(2), U8(1),
+  B(Ldar), R(1),
+  B(Star), R(0),
+  B(LdaUndefined),
+  B(Return),
+]
+constant pool: [
+  "x",
+]
+handlers: [
+]
+