[Turbofan] Add concept of FP register aliasing on ARM 32.

src/arm/macro-assembler-arm.h

 // 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.
 
 #ifndef V8_ARM_MACRO_ASSEMBLER_ARM_H_
 #define V8_ARM_MACRO_ASSEMBLER_ARM_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
@@ skipping 531 matching lines @@
 
   void Vmov(const DwVfpRegister dst,
             const double imm,
             const Register scratch = no_reg);
 
   void VmovHigh(Register dst, DwVfpRegister src);
   void VmovHigh(DwVfpRegister dst, Register src);
   void VmovLow(Register dst, DwVfpRegister src);
   void VmovLow(DwVfpRegister dst, Register src);
 
+  // Simulate s-register moves for imaginary s32 - s63 registers.
+  void VmovExtended(Register dst, int src_code);
+  void VmovExtended(int dst_code, Register src);
+  // Move between s-registers and imaginary s-registers.
+  void VmovExtended(int dst_code, int src_code, Register scratch);
+  void VmovExtended(int dst_code, const MemOperand& src, Register scratch);
+  void VmovExtended(const MemOperand& dst, int src_code, Register scratch);
+
   void LslPair(Register dst_low, Register dst_high, Register src_low,
                Register src_high, Register scratch, Register shift);
   void LslPair(Register dst_low, Register dst_high, Register src_low,
                Register src_high, uint32_t shift);
   void LsrPair(Register dst_low, Register dst_high, Register src_low,
                Register src_high, Register scratch, Register shift);
   void LsrPair(Register dst_low, Register dst_high, Register src_low,
                Register src_high, uint32_t shift);
   void AsrPair(Register dst_low, Register dst_high, Register src_low,
                Register src_high, Register scratch, Register shift);
@@ skipping 1028 matching lines @@
 inline MemOperand NativeContextMemOperand() {
   return ContextMemOperand(cp, Context::NATIVE_CONTEXT_INDEX);
 }
 
 #define ACCESS_MASM(masm) masm->
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM_MACRO_ASSEMBLER_ARM_H_