[turbofan] Unify referencing of stack slots

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 28c99b95544ba4e7c3839730f5e4ab117f0e3087..101a10ae5b55ad4981d8c464df117d2c9d5ccae6 100644
--- a/src/compiler/register-allocator.cc
+++ b/src/compiler/register-allocator.cc
@@ -1367,7 +1367,7 @@ void ConstraintBuilder::MeetConstraintsAfter(int instr_index) {
       // This value is produced on the stack, we never need to spill it.
       if (first_output->IsStackSlot()) {
         DCHECK(StackSlotOperand::cast(first_output)->index() <
-               data()->frame()->GetSpillSlotCount());
+               data()->frame()->GetTotalFrameSlotCount());
         range->SetSpillOperand(StackSlotOperand::cast(first_output));
         range->SetSpillStartIndex(instr_index + 1);
         assigned = true;