ARM64: Introduce TempDoubleRegister as a lithium operand constraint.

src/lithium.cc

 // Copyright 2012 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 "v8.h"
 #include "lithium.h"
 #include "scopes.h"
 
 #if V8_TARGET_ARCH_IA32
 #include "ia32/lithium-ia32.h"
@@ skipping 44 matching lines @@
         case LUnallocated::FIXED_DOUBLE_REGISTER: {
           int reg_index = unalloc->fixed_register_index();
           const char* double_register_name =
               DoubleRegister::AllocationIndexToString(reg_index);
           stream->Add("(=%s)", double_register_name);
           break;
         }
         case LUnallocated::MUST_HAVE_REGISTER:
           stream->Add("(R)");
           break;
+        case LUnallocated::MUST_HAVE_DOUBLE_REGISTER:
+          stream->Add("(D)");
+          break;
         case LUnallocated::WRITABLE_REGISTER:
           stream->Add("(WR)");
           break;
         case LUnallocated::SAME_AS_FIRST_INPUT:
           stream->Add("(1)");
           break;
         case LUnallocated::ANY:
           stream->Add("(-)");
           break;
       }
@@ skipping 527 matching lines @@
 
 
 LPhase::~LPhase() {
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceLithium(name(), chunk_);
   }
 }
 
 
 } }  // namespace v8::internal