[Interpreter] Avoid allocating pairs array in VisitDeclarations.

src/interpreter/bytecode-array-builder.cc

Index: src/interpreter/bytecode-array-builder.cc
diff --git a/src/interpreter/bytecode-array-builder.cc b/src/interpreter/bytecode-array-builder.cc
index 4194e85c2597f0f1eeaf4707f197bc72d6e8305c..967b8de8abb16abb65d982053e39710c5e00d86e 100644
--- a/src/interpreter/bytecode-array-builder.cc
+++ b/src/interpreter/bytecode-array-builder.cc
@@ -179,6 +179,12 @@ BytecodeArrayBuilder& BytecodeArrayBuilder::CompareOperation(Token::Value op,
   return *this;
 }
 
+BytecodeArrayBuilder& BytecodeArrayBuilder::LoadConstantPoolEntry(
+    size_t entry) {
+  Output(Bytecode::kLdaConstant, UnsignedOperand(entry));
+  return *this;
+}
+
 BytecodeArrayBuilder& BytecodeArrayBuilder::LoadLiteral(
     v8::internal::Smi* smi) {
   int32_t raw_smi = smi->value();
@@ -632,6 +638,15 @@ size_t BytecodeArrayBuilder::GetConstantPoolEntry(Handle<Object> object) {
   return constant_array_builder()->Insert(object);
 }
 
+size_t BytecodeArrayBuilder::ReserveConstantPoolEntry() {
+  return constant_array_builder()->ReserveEntry();
+}
+
+void BytecodeArrayBuilder::InsertReservedConstantPoolEntry(
+    size_t entry, Handle<Object> object) {
+  constant_array_builder()->InsertReservedEntry(entry, object);
+}
+
 void BytecodeArrayBuilder::SetReturnPosition() {
   if (return_position_ == kNoSourcePosition) return;
   latest_source_info_.MakeStatementPosition(return_position_);