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

  The CL #34967 (https://codereview.chromium.org/1804243003) and CL #35045 (https://codereview.chromium.org/1825333004)
  exposed one hidden bug in x87 turbofan code generation for Float32ToFloat64.

  This CL fixed this bug.

BUG=

Review URL: https://codereview.chromium.org/1847493002

Cr-Commit-Position: refs/heads/master@{#35129}

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());