[Interpreter] Remove register file register and replace with LoadParentFramePointer.

test/unittests/interpreter/bytecode-array-builder-unittest.cc

Index: test/unittests/interpreter/bytecode-array-builder-unittest.cc
diff --git a/test/unittests/interpreter/bytecode-array-builder-unittest.cc b/test/unittests/interpreter/bytecode-array-builder-unittest.cc
index 255d836af535844fd1794505582fffd3d22cf0e8..bcd7710cda266242596ef94072a566c0fc8b5273 100644
--- a/test/unittests/interpreter/bytecode-array-builder-unittest.cc
+++ b/test/unittests/interpreter/bytecode-array-builder-unittest.cc
@@ -364,14 +364,11 @@ TEST_F(BytecodeArrayBuilderTest, FrameSizesLookGood) {
 
 TEST_F(BytecodeArrayBuilderTest, RegisterValues) {
   int index = 1;
-  int32_t operand = -index;
 
   Register the_register(index);
   CHECK_EQ(the_register.index(), index);
 
   int actual_operand = the_register.ToOperand();
-  CHECK_EQ(actual_operand, operand);
-
   int actual_index = Register::FromOperand(actual_operand).index();
   CHECK_EQ(actual_index, index);
 }