Implement more intrinisification for x64 (not as inlined code but as header of the target).

runtime/vm/intrinsifier_ia32.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // The intrinsic code below is executed before a method has built its frame.
 // The return address is on the stack and the arguments below it.
 // Registers EDX (arguments descriptor) and ECX (function) must be preserved.
 // Each intrinsification method returns true if the corresponding
 // Dart method was intrinsified.
 
@@ skipping 1114 matching lines @@
   __ j(NOT_ZERO, &is_true, Assembler::kNearJump);
   __ jmp(&is_false, Assembler::kNearJump);
   return true;  // Method is complete, no slow case.
 }
 
 
 // Argument type is not known
 bool Intrinsifier::Math_sqrt(Assembler* assembler) {
   Label fall_through, is_smi, double_op;
   TestLastArgumentIsDouble(assembler, &is_smi, &fall_through);
-  // Argument is double and is in EAX, class in EBX.
+  // Argument is double and is in EAX.
   __ movsd(XMM1, FieldAddress(EAX, Double::value_offset()));
   __ Bind(&double_op);
   __ sqrtsd(XMM0, XMM1);
   const Class& double_class = Class::Handle(
       Isolate::Current()->object_store()->double_class());
   AssemblerMacros::TryAllocate(assembler,
                                double_class,
                                &fall_through,
                                EAX);  // Result register.
   __ movsd(FieldAddress(EAX, Double::value_offset()), XMM0);
@@ skipping 218 matching lines @@
   __ Bind(&is_true);
   __ LoadObject(EAX, bool_true);
   __ ret();
   return true;
 }
 
 #undef __
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32