[Interpreter] Ensure we always have an outer register allocation scope.

src/interpreter/bytecode-array-builder.h

Index: src/interpreter/bytecode-array-builder.h
diff --git a/src/interpreter/bytecode-array-builder.h b/src/interpreter/bytecode-array-builder.h
index 1d2edea99ca95c4e69638b50fb74cccf72af2e13..7c23dc3f22caa035e19de98ad7759aef7d6bf15d 100644
--- a/src/interpreter/bytecode-array-builder.h
+++ b/src/interpreter/bytecode-array-builder.h
@@ -334,7 +334,8 @@ class BytecodeArrayBuilder final {
   ZoneSet<int> free_temporaries_;
 
   class PreviousBytecodeHelper;
-  friend class TemporaryRegisterScope;
+  friend class BytecodeRegisterAllocator;
+
   DISALLOW_COPY_AND_ASSIGN(BytecodeArrayBuilder);
 };
 
@@ -379,38 +380,6 @@ class BytecodeLabel final {
   friend class BytecodeArrayBuilder;
 };
 
-
-// A stack-allocated class than allows the instantiator to allocate
-// temporary registers that are cleaned up when scope is closed.
-// TODO(oth): Deprecate TemporaryRegisterScope use. Code should be
-// using result scopes as far as possible.
-class TemporaryRegisterScope {
- public:
-  explicit TemporaryRegisterScope(BytecodeArrayBuilder* builder);
-  ~TemporaryRegisterScope();
-  Register NewRegister();
-
-  void PrepareForConsecutiveAllocations(size_t count);
-  Register NextConsecutiveRegister();
-
-  bool RegisterIsAllocatedInThisScope(Register reg) const;
-
-  bool hasConsecutiveAllocations() const { return next_consecutive_count_ > 0; }
-
- private:
-  void* operator new(size_t size);
-  void operator delete(void* p);
-
-  BytecodeArrayBuilder* builder_;
-  const TemporaryRegisterScope* outer_;
-  ZoneVector<int> allocated_;
-  int next_consecutive_register_;
-  int next_consecutive_count_;
-
-  DISALLOW_COPY_AND_ASSIGN(TemporaryRegisterScope);
-};
-
-
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8