[X87] [TurboFan] Fix Float32ToFloat64 code generation bug.

src/compiler/x87/code-generator-x87.cc

Index: src/compiler/x87/code-generator-x87.cc
diff --git a/src/compiler/x87/code-generator-x87.cc b/src/compiler/x87/code-generator-x87.cc
index 3828e7d5cf0cd9ea564916f95ca458aab2eddbef..b0d3203a3cbbf0ba371c5621a506541697c68b71 100644
--- a/src/compiler/x87/code-generator-x87.cc
+++ b/src/compiler/x87/code-generator-x87.cc
@@ -1295,8 +1295,8 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       InstructionOperand* input = instr->InputAt(0);
       if (input->IsDoubleRegister()) {
         __ sub(esp, Immediate(kDoubleSize));
-        __ fstp_d(MemOperand(esp, 0));
-        __ fld_d(MemOperand(esp, 0));
+        __ fstp_s(MemOperand(esp, 0));
+        __ fld_s(MemOperand(esp, 0));
         __ add(esp, Immediate(kDoubleSize));
       } else {
         DCHECK(input->IsDoubleStackSlot());