Implement bigint shift intrinsics on x64.

runtime/vm/intrinsifier_ia32.cc

 // Copyright (c) 2013, 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 787 matching lines @@
   __ xorl(EAX, ECX);
   // BSR does not write the destination register if source is zero.  Put a 1 in
   // the Smi tag bit to ensure BSR writes to destination register.
   __ orl(EAX, Immediate(kSmiTagMask));
   __ bsrl(EAX, EAX);
   __ SmiTag(EAX);
   __ ret();
 }
 
 
+void Intrinsifier::Bigint_lsh(Assembler* assembler) {
+  // TODO(regis): Implement.
+}
+
+
+void Intrinsifier::Bigint_rsh(Assembler* assembler) {
+  // TODO(regis): Implement.
+}
+
+
 void Intrinsifier::Bigint_absAdd(Assembler* assembler) {
   // static void _absAdd(Uint32List digits, int used,
   //                     Uint32List a_digits, int a_used,
   //                     Uint32List r_digits)
 
   __ movl(EDI, Address(ESP, 5 * kWordSize));  // digits
   __ movl(EAX, Address(ESP, 4 * kWordSize));  // used is Smi
   __ SmiUntag(EAX);  // used > 0.
   __ movl(ESI, Address(ESP, 3 * kWordSize));  // a_digits
   __ movl(ECX, Address(ESP, 2 * kWordSize));  // a_used is Smi
@@ skipping 1188 matching lines @@
                         Isolate::current_tag_offset());
   // Set return value to Isolate::current_tag_.
   __ movl(EAX, current_tag_addr);
   __ ret();
 }
 
 #undef __
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32