[turbofan] Implement OSR for outer loops.

src/compiler/instruction-selector-impl.h

 // 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.
 
 #ifndef V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_
 #define V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_
 
 #include "src/compiler/instruction.h"
 #include "src/compiler/instruction-selector.h"
 #include "src/compiler/linkage.h"
@@ skipping 170 matching lines @@
     DCHECK_NOT_NULL(node);
     DCHECK_NOT_NULL(operand);
     operand->set_virtual_register(selector_->GetVirtualRegister(node));
     selector()->MarkAsUsed(node);
     return operand;
   }
 
   UnallocatedOperand* ToUnallocatedOperand(LinkageLocation location,
                                            MachineType type) {
     if (location.location_ == LinkageLocation::ANY_REGISTER) {
+      // any machine register.
       return new (zone())
           UnallocatedOperand(UnallocatedOperand::MUST_HAVE_REGISTER);
     }
     if (location.location_ < 0) {
+      // a location on the caller frame.
       return new (zone()) UnallocatedOperand(UnallocatedOperand::FIXED_SLOT,
                                              location.location_);
     }
+    if (location.location_ > LinkageLocation::ANY_REGISTER) {
+      // a spill location on this (callee) frame.
+      return new (zone()) UnallocatedOperand(
+          UnallocatedOperand::FIXED_SLOT,
+          location.location_ - LinkageLocation::ANY_REGISTER - 1);
+    }
+    // a fixed register.
     if (RepresentationOf(type) == kRepFloat64) {
       return new (zone()) UnallocatedOperand(
           UnallocatedOperand::FIXED_DOUBLE_REGISTER, location.location_);
     }
     return new (zone()) UnallocatedOperand(UnallocatedOperand::FIXED_REGISTER,
                                            location.location_);
   }
 
   InstructionSelector* selector_;
 };
@@ skipping 150 matching lines @@
                : (frame_state_descriptor->GetTotalSize() +
                   1);  // Include deopt id.
   }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_