[turbofan] Implemented the optional Float32RoundDown operator.

src/compiler/ia32/instruction-codes-ia32.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_IA32_INSTRUCTION_CODES_IA32_H_
 #define V8_COMPILER_IA32_INSTRUCTION_CODES_IA32_H_
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 25 matching lines @@
   V(SSEFloat32Cmp)                 \
   V(SSEFloat32Add)                 \
   V(SSEFloat32Sub)                 \
   V(SSEFloat32Mul)                 \
   V(SSEFloat32Div)                 \
   V(SSEFloat32Max)                 \
   V(SSEFloat32Min)                 \
   V(SSEFloat32Abs)                 \
   V(SSEFloat32Neg)                 \
   V(SSEFloat32Sqrt)                \
+  V(SSEFloat32Round)               \
   V(SSEFloat64Cmp)                 \
   V(SSEFloat64Add)                 \
   V(SSEFloat64Sub)                 \
   V(SSEFloat64Mul)                 \
   V(SSEFloat64Div)                 \
   V(SSEFloat64Mod)                 \
   V(SSEFloat64Max)                 \
   V(SSEFloat64Min)                 \
   V(SSEFloat64Abs)                 \
   V(SSEFloat64Neg)                 \
@@ skipping 74 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_IA32_INSTRUCTION_CODES_IA32_H_