[turbofan] push virtual register field down to InstructionOperand

src/compiler/register-allocator.cc

Index: src/compiler/register-allocator.cc
diff --git a/src/compiler/register-allocator.cc b/src/compiler/register-allocator.cc
index 4e5e53b2e6da1d5eba133550d83a1bdb8d803518..7a72b9fd17b486835519930fa283fe9aa28e9952 100644
--- a/src/compiler/register-allocator.cc
+++ b/src/compiler/register-allocator.cc
@@ -1076,9 +1076,8 @@ void RegisterAllocator::MeetRegisterConstraintsForLastInstructionInBlock(
 
         // Create an unconstrained operand for the same virtual register
         // and insert a gap move from the fixed output to the operand.
-        UnallocatedOperand* output_copy =
-            new (code_zone()) UnallocatedOperand(UnallocatedOperand::ANY);
-        output_copy->set_virtual_register(output_vreg);
+        UnallocatedOperand* output_copy = new (code_zone())
+            UnallocatedOperand(UnallocatedOperand::ANY, output_vreg);
 
         AddGapMove(gap_index, GapInstruction::START, output, output_copy);
       }