MIPS64 [turbofan]: Fix AssembleSwap for double stack slots.

src/compiler/mips64/code-generator-mips64.cc

 // 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.
 
 #include "src/compiler/code-generator.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/mips/macro-assembler-mips.h"
 #include "src/scopes.h"
@@ skipping 1222 matching lines @@
       MemOperand dst = g.ToMemOperand(destination);
       __ Move(temp, src);
       __ ldc1(src, dst);
       __ sdc1(temp, dst);
     }
   } else if (source->IsDoubleStackSlot()) {
     DCHECK(destination->IsDoubleStackSlot());
     Register temp_0 = kScratchReg;
     FPURegister temp_1 = kScratchDoubleReg;
     MemOperand src0 = g.ToMemOperand(source);
-    MemOperand src1(src0.rm(), src0.offset() + kPointerSize);
+    MemOperand src1(src0.rm(), src0.offset() + kIntSize);
     MemOperand dst0 = g.ToMemOperand(destination);
-    MemOperand dst1(dst0.rm(), dst0.offset() + kPointerSize);
+    MemOperand dst1(dst0.rm(), dst0.offset() + kIntSize);
     __ ldc1(temp_1, dst0);  // Save destination in temp_1.
     __ lw(temp_0, src0);    // Then use temp_0 to copy source to destination.
     __ sw(temp_0, dst0);
     __ lw(temp_0, src1);
     __ sw(temp_0, dst1);
     __ sdc1(temp_1, src0);
   } else {
     // No other combinations are possible.
     UNREACHABLE();
   }
@@ skipping 32 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8