[turbofan] add non fixed slot constraint to register allocator

src/compiler/instruction.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/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/instruction.h"
 #include "src/compiler/schedule.h"
 
 namespace v8 {
@@ skipping 15 matching lines @@
         case UnallocatedOperand::NONE:
           return os;
         case UnallocatedOperand::FIXED_REGISTER:
           return os << "(=" << conf->general_register_name(
                                    unalloc->fixed_register_index()) << ")";
         case UnallocatedOperand::FIXED_DOUBLE_REGISTER:
           return os << "(=" << conf->double_register_name(
                                    unalloc->fixed_register_index()) << ")";
         case UnallocatedOperand::MUST_HAVE_REGISTER:
           return os << "(R)";
+        case UnallocatedOperand::MUST_HAVE_SLOT:
+          return os << "(S)";
         case UnallocatedOperand::SAME_AS_FIRST_INPUT:
           return os << "(1)";
         case UnallocatedOperand::ANY:
           return os << "(-)";
       }
     }
     case InstructionOperand::CONSTANT:
       return os << "[constant:" << op.index() << "]";
     case InstructionOperand::IMMEDIATE:
       return os << "[immediate:" << op.index() << "]";
@@ skipping 684 matching lines @@
       os << " B" << succ.ToInt();
     }
     os << "\n";
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8