[turbofan] Remove the FloatXXSubPreserveNan operators.

src/compiler/mips/instruction-codes-mips.h

 // 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.
 
 #ifndef V8_COMPILER_MIPS_INSTRUCTION_CODES_MIPS_H_
 #define V8_COMPILER_MIPS_INSTRUCTION_CODES_MIPS_H_
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 29 matching lines @@
   V(MipsSarPair)                   \
   V(MipsExt)                       \
   V(MipsIns)                       \
   V(MipsRor)                       \
   V(MipsMov)                       \
   V(MipsTst)                       \
   V(MipsCmp)                       \
   V(MipsCmpS)                      \
   V(MipsAddS)                      \
   V(MipsSubS)                      \
-  V(MipsSubPreserveNanS)           \
   V(MipsMulS)                      \
   V(MipsDivS)                      \
   V(MipsModS)                      \
   V(MipsAbsS)                      \
   V(MipsSqrtS)                     \
   V(MipsMaxS)                      \
   V(MipsMinS)                      \
   V(MipsCmpD)                      \
   V(MipsAddD)                      \
   V(MipsSubD)                      \
-  V(MipsSubPreserveNanD)           \
   V(MipsMulD)                      \
   V(MipsDivD)                      \
   V(MipsModD)                      \
   V(MipsAbsD)                      \
   V(MipsSqrtD)                     \
   V(MipsMaxD)                      \
   V(MipsMinD)                      \
   V(MipsNegS)                      \
   V(MipsNegD)                      \
   V(MipsAddPair)                   \
@@ skipping 72 matching lines @@
 #define TARGET_ADDRESSING_MODE_LIST(V) \
   V(MRI) /* [%r0 + K] */               \
   V(MRR) /* [%r0 + %r1] */
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MIPS_INSTRUCTION_CODES_MIPS_H_