X87: [turbofan] Avoid unnecessary write barriers and improve code generation.

src/compiler/x87/instruction-codes-x87.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_X87_INSTRUCTION_CODES_X87_H_
 #define V8_COMPILER_X87_INSTRUCTION_CODES_X87_H_
 
 #include "src/compiler/instruction.h"
 #include "src/compiler/instruction-codes.h"
 namespace v8 {
@@ skipping 63 matching lines @@
   V(X87Movl)                       \
   V(X87Movss)                      \
   V(X87Movsd)                      \
   V(X87Lea)                        \
   V(X87BitcastFI)                  \
   V(X87BitcastIF)                  \
   V(X87Push)                       \
   V(X87PushFloat64)                \
   V(X87PushFloat32)                \
   V(X87Poke)                       \
-  V(X87StoreWriteBarrier)          \
   V(X87StackCheck)
 
 
 // Addressing modes represent the "shape" of inputs to an instruction.
 // Many instructions support multiple addressing modes. Addressing modes
 // are encoded into the InstructionCode of the instruction and tell the
 // code generator after register allocation which assembler method to call.
 //
 // We use the following local notation for addressing modes:
 //
@@ skipping 21 matching lines @@
   V(M2I)  /* [      %r2*2 + K] */      \
   V(M4I)  /* [      %r2*4 + K] */      \
   V(M8I)  /* [      %r2*8 + K] */      \
   V(MI)   /* [              K] */
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_X87_INSTRUCTION_CODES_X87_H_