[turbofan] Implement OSR for outer loops.

src/compiler/register-allocator.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/linkage.h"
 #include "src/compiler/register-allocator.h"
 #include "src/string-stream.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 1044 matching lines @@
     auto output_operand = last_instruction->OutputAt(i);
     DCHECK(!output_operand->IsConstant());
     auto output = UnallocatedOperand::cast(output_operand);
     int output_vreg = output->virtual_register();
     auto range = LiveRangeFor(output_vreg);
     bool assigned = false;
     if (output->HasFixedPolicy()) {
       AllocateFixed(output, -1, false);
       // This value is produced on the stack, we never need to spill it.
       if (output->IsStackSlot()) {
-        DCHECK(output->index() < 0);
+        DCHECK(output->index() < frame_->GetSpillSlotCount());
         range->SetSpillOperand(output);
         range->SetSpillStartIndex(end);
         assigned = true;
       }
 
       for (auto succ : block->successors()) {
         const InstructionBlock* successor = code()->InstructionBlockAt(succ);
         DCHECK(successor->PredecessorCount() == 1);
         int gap_index = successor->first_instruction_index() + 1;
         DCHECK(code()->IsGapAt(gap_index));
@@ skipping 45 matching lines @@
         auto first_output = UnallocatedOperand::cast(output);
         auto range = LiveRangeFor(first_output->virtual_register());
         bool assigned = false;
         if (first_output->HasFixedPolicy()) {
           auto output_copy = first_output->CopyUnconstrained(code_zone());
           bool is_tagged = HasTaggedValue(first_output->virtual_register());
           AllocateFixed(first_output, gap_index, is_tagged);
 
           // This value is produced on the stack, we never need to spill it.
           if (first_output->IsStackSlot()) {
-            DCHECK(first_output->index() < 0);
+            DCHECK(first_output->index() < frame_->GetSpillSlotCount());
             range->SetSpillOperand(first_output);
             range->SetSpillStartIndex(gap_index - 1);
             assigned = true;
           }
           AddGapMove(gap_index, GapInstruction::START, first_output,
                      output_copy);
         }
 
         // Make sure we add a gap move for spilling (if we have not done
         // so already).
@@ skipping 1328 matching lines @@
   } else {
     DCHECK(range->Kind() == GENERAL_REGISTERS);
     assigned_registers_->Add(reg);
   }
   range->set_assigned_register(reg, code_zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8