[turbofan] Fix double register swap in ARM and ARM64 backends.

src/compiler/arm/code-generator-arm.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/arm/macro-assembler-arm.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 801 matching lines @@
     __ vldr(temp_1, dst);
     __ str(temp_0, dst);
     __ vstr(temp_1, src);
   } else if (source->IsDoubleRegister()) {
     DwVfpRegister temp = kScratchDoubleReg;
     DwVfpRegister src = g.ToDoubleRegister(source);
     if (destination->IsDoubleRegister()) {
       DwVfpRegister dst = g.ToDoubleRegister(destination);
       __ Move(temp, src);
       __ Move(src, dst);
-      __ Move(src, temp);
+      __ Move(dst, temp);
     } else {
       DCHECK(destination->IsDoubleStackSlot());
       MemOperand dst = g.ToMemOperand(destination);
       __ Move(temp, src);
       __ vldr(src, dst);
       __ vstr(temp, dst);
     }
   } else if (source->IsDoubleStackSlot()) {
     DCHECK(destination->IsDoubleStackSlot());
     Register temp_0 = kScratchReg;
@@ skipping 17 matching lines @@
 
 void CodeGenerator::AddNopForSmiCodeInlining() {
   // On 32-bit ARM we do not insert nops for inlined Smi code.
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8