[turbofan] Add support for reinterpreting integers as floating point and vice versa.

src/compiler/arm64/code-generator-arm64.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/arm64/frames-arm64.h"
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
@@ skipping 868 matching lines @@
     }
     case kArm64Float64InsertHighWord32: {
       // TODO(arm64): This should use MOV (from general) when NEON is supported.
       UseScratchRegisterScope scope(masm());
       Register tmp = scope.AcquireX();
       __ Fmov(tmp.W(), i.InputFloat32Register(0));
       __ Bfi(tmp, i.InputRegister(1), 32, 32);
       __ Fmov(i.OutputFloat64Register(), tmp);
       break;
     }
-    case kArm64Float64MoveU64: {
+    case kArm64Float64MoveU64:
       __ Fmov(i.OutputFloat64Register(), i.InputRegister(0));
       break;
-    }
+    case kArm64U64MoveFloat64:
+      __ Fmov(i.OutputRegister(), i.InputDoubleRegister(0));
+      break;
     case kArm64Ldrb:
       __ Ldrb(i.OutputRegister(), i.MemoryOperand());
       break;
     case kArm64Ldrsb:
       __ Ldrsb(i.OutputRegister(), i.MemoryOperand());
       break;
     case kArm64Strb:
       __ Strb(i.InputRegister(2), i.MemoryOperand());
       break;
     case kArm64Ldrh:
@@ skipping 497 matching lines @@
       padding_size -= kInstructionSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8