ARM64: Give LR to the allocator.

src/arm64/macro-assembler-arm64.h

 // Copyright 2013 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_ARM64_MACRO_ASSEMBLER_ARM64_H_
 #define V8_ARM64_MACRO_ASSEMBLER_ARM64_H_
 
 #include <vector>
 
 #include "src/globals.h"
@@ skipping 2219 matching lines @@
   // automatically when the scope ends.
   Register AcquireW() { return AcquireNextAvailable(available_).W(); }
   Register AcquireX() { return AcquireNextAvailable(available_).X(); }
   FPRegister AcquireS() { return AcquireNextAvailable(availablefp_).S(); }
   FPRegister AcquireD() { return AcquireNextAvailable(availablefp_).D(); }
 
   Register UnsafeAcquire(const Register& reg) {
     return Register(UnsafeAcquire(available_, reg));
   }
 
+  Register Acquire(const Register& reg) {
+    CHECK(available_->IncludesAliasOf(reg));
+    return UnsafeAcquire(reg);
+  }
+
   Register AcquireSameSizeAs(const Register& reg);
   FPRegister AcquireSameSizeAs(const FPRegister& reg);
 
  private:
   static CPURegister AcquireNextAvailable(CPURegList* available);
   static CPURegister UnsafeAcquire(CPURegList* available,
                                    const CPURegister& reg);
 
   // Available scratch registers.
   CPURegList* available_;     // kRegister
@@ skipping 68 matching lines @@
 #error "Unsupported option"
 #define CODE_COVERAGE_STRINGIFY(x) #x
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 #endif  // V8_ARM64_MACRO_ASSEMBLER_ARM64_H_