X87: [turbofan] Implemented the optional Float32RoundDown operator.

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 25 matching lines @@
   V(X87Popcnt)                     \
   V(X87Float32Cmp)                 \
   V(X87Float32Add)                 \
   V(X87Float32Sub)                 \
   V(X87Float32Mul)                 \
   V(X87Float32Div)                 \
   V(X87Float32Max)                 \
   V(X87Float32Min)                 \
   V(X87Float32Abs)                 \
   V(X87Float32Sqrt)                \
+  V(X87Float32Round)               \
   V(X87LoadFloat64Constant)        \
   V(X87Float64Add)                 \
   V(X87Float64Sub)                 \
   V(X87Float64Mul)                 \
   V(X87Float64Div)                 \
   V(X87Float64Mod)                 \
   V(X87Float64Max)                 \
   V(X87Float64Min)                 \
   V(X87Float64Abs)                 \
   V(X87Int32ToFloat64)             \
@@ skipping 59 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_