Fix missing cases of empty_string canonicalization

src/mips64/macro-assembler-mips64.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 <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_MIPS64
 
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
@@ skipping 5859 matching lines @@
     }
   }
 
   if (do_return) {
     Ret(USE_DELAY_SLOT);
     // If returning, the instruction in the delay slot will be the addiu below.
   }
   daddiu(sp, sp, 2 * kPointerSize);
 }
 
-
-void MacroAssembler::InitializeNewString(Register string,
-                                         Register length,
-                                         Heap::RootListIndex map_index,
-                                         Register scratch1,
-                                         Register scratch2) {
-  // dsll(scratch1, length, kSmiTagSize);
-  dsll32(scratch1, length, 0);
-  LoadRoot(scratch2, map_index);
-  sd(scratch1, FieldMemOperand(string, String::kLengthOffset));
-  li(scratch1, Operand(String::kEmptyHashField));
-  sd(scratch2, FieldMemOperand(string, HeapObject::kMapOffset));
-  sw(scratch1, FieldMemOperand(string, String::kHashFieldOffset));
-}
-
-
 int MacroAssembler::ActivationFrameAlignment() {
 #if V8_HOST_ARCH_MIPS || V8_HOST_ARCH_MIPS64
   // Running on the real platform. Use the alignment as mandated by the local
   // environment.
   // Note: This will break if we ever start generating snapshots on one Mips
   // platform for another Mips platform with a different alignment.
   return base::OS::ActivationFrameAlignment();
 #else  // V8_HOST_ARCH_MIPS
   // If we are using the simulator then we should always align to the expected
   // alignment. As the simulator is used to generate snapshots we do not know
@@ skipping 1035 matching lines @@
   if (mag.shift > 0) sra(result, result, mag.shift);
   srl(at, dividend, 31);
   Addu(result, result, Operand(at));
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS64