[Interpreter] Refactor bytecode generator test suite.

test/cctest/interpreter/bytecode_expectations/GlobalCompoundExpressions.golden

+#
+# Autogenerated by generate-bytecode-expectations
+#
+
+---
+pool type: string
+execute: yes
+wrap: no
+test function name: f
+
+---
+snippet: "
+  var global = 1;
+  function f() { return global &= 1; }
+  f()
+"
+frame size: 1
+parameter count: 1
+bytecode array length: 14
+bytecodes: [
+  B(StackCheck),
+  B(LdaGlobal), U8(0), U8(1),
+  B(Star), R(0),
+  B(LdaSmi8), U8(1),
+  B(BitwiseAnd), R(0),
+  B(StaGlobalSloppy), U8(0), U8(3),
+  B(Return),
+]
+constant pool: [
+  "global",
+]
+handlers: [
+]
+
+---
+snippet: "
+  unallocated = 1;
+  function f() { return unallocated += 1; }
+  f()
+"
+frame size: 1
+parameter count: 1
+bytecode array length: 14
+bytecodes: [
+  B(StackCheck),
+  B(LdaGlobal), U8(0), U8(1),
+  B(Star), R(0),
+  B(LdaSmi8), U8(1),
+  B(Add), R(0),
+  B(StaGlobalSloppy), U8(0), U8(3),
+  B(Return),
+]
+constant pool: [
+  "unallocated",
+]
+handlers: [
+]
+