Inline Math.fround in optimized code.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index ced3a235839893e5c542a26fe703c83c8b300ef5..c1881b6cbb6a03711dab3d90a17ec79d17039a19 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -3724,6 +3724,14 @@ void LCodeGen::DoMathRound(LMathRound* instr) {
 }
 
 
+void LCodeGen::DoMathFround(LMathFround* instr) {
+  XMMRegister input_reg = ToDoubleRegister(instr->value());
+  XMMRegister output_reg = ToDoubleRegister(instr->result());
+  __ cvtsd2ss(output_reg, input_reg);
+  __ cvtss2sd(output_reg, output_reg);
+}
+
+
 void LCodeGen::DoMathSqrt(LMathSqrt* instr) {
   Operand input = ToOperand(instr->value());
   XMMRegister output = ToDoubleRegister(instr->result());