[turbofan] Allow encodable 64-bit constants as immediate for ARM64.

src/compiler/instruction-selector-unittest.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_UNITTEST_H_
 #define V8_COMPILER_INSTRUCTION_SELECTOR_UNITTEST_H_
 
 #include <deque>
 #include <set>
 
@@ skipping 129 matching lines @@
       return IsReference(ToVreg(operand));
     }
     bool IsReference(int virtual_register) const {
       return references_.find(virtual_register) != references_.end();
     }
 
     int32_t ToInt32(const InstructionOperand* operand) const {
       return ToConstant(operand).ToInt32();
     }
 
+    int64_t ToInt64(const InstructionOperand* operand) const {
+      return ToConstant(operand).ToInt64();
+    }
+
     int ToVreg(const InstructionOperand* operand) const {
       if (operand->IsConstant()) return operand->index();
       EXPECT_EQ(InstructionOperand::UNALLOCATED, operand->kind());
       return UnallocatedOperand::cast(operand)->virtual_register();
     }
 
     FrameStateDescriptor* GetFrameStateDescriptor(int deoptimization_id) {
       EXPECT_LT(deoptimization_id, GetFrameStateDescriptorCount());
       return deoptimization_entries_[deoptimization_id];
     }
@@ skipping 36 matching lines @@
 template <typename T>
 class InstructionSelectorTestWithParam
     : public InstructionSelectorTest,
       public ::testing::WithParamInterface<T> {};
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_SELECTOR_UNITTEST_H_