X87: Inline Math.fround in optimized code.

src/x87/lithium-x87.cc

Index: src/x87/lithium-x87.cc
diff --git a/src/x87/lithium-x87.cc b/src/x87/lithium-x87.cc
index 290f4f21fa796d9b5d83dceae258f56f00c4d570..361b20be0b2fd2ffc8feec862de0c6870b821949 100644
--- a/src/x87/lithium-x87.cc
+++ b/src/x87/lithium-x87.cc
@@ -1148,6 +1148,7 @@ LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
   switch (instr->op()) {
     case kMathFloor: return DoMathFloor(instr);
     case kMathRound: return DoMathRound(instr);
+    case kMathFround: return DoMathFround(instr);
     case kMathAbs: return DoMathAbs(instr);
     case kMathLog: return DoMathLog(instr);
     case kMathExp: return DoMathExp(instr);
@@ -1175,6 +1176,13 @@ LInstruction* LChunkBuilder::DoMathRound(HUnaryMathOperation* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoMathFround(HUnaryMathOperation* instr) {
+  LOperand* input = UseRegisterAtStart(instr->value());
+  LMathFround* result = new (zone()) LMathFround(input);
+  return AssignEnvironment(DefineAsRegister(result));
+}
+
+
 LInstruction* LChunkBuilder::DoMathAbs(HUnaryMathOperation* instr) {
   LOperand* context = UseAny(instr->context());  // Deferred use.
   LOperand* input = UseRegisterAtStart(instr->value());