MIPS: Remove unnecessary NaN fix for simulator.

BUG=

Review URL: https://codereview.chromium.org/1502153007

Cr-Commit-Position: refs/heads/master@{#32721}

src/crankshaft/mips/lithium-codegen-mips.cc

@@ -1635,20 +1635,6 @@ void LCodeGen::DoConstantS(LConstantS* instr) {
 void LCodeGen::DoConstantD(LConstantD* instr) {
   DCHECK(instr->result()->IsDoubleRegister());
   DoubleRegister result = ToDoubleRegister(instr->result());
-#if V8_HOST_ARCH_IA32
-  // Need some crappy work-around for x87 sNaN -> qNaN breakage in simulator
-  // builds.
-  uint64_t bits = instr->bits();
-  if ((bits & V8_UINT64_C(0x7FF8000000000000)) ==
-      V8_UINT64_C(0x7FF0000000000000)) {
-    uint32_t lo = static_cast<uint32_t>(bits);
-    uint32_t hi = static_cast<uint32_t>(bits >> 32);
-    __ li(at, Operand(lo));
-    __ li(scratch0(), Operand(hi));
-    __ Move(result, at, scratch0());
-    return;
-  }
-#endif
   double v = instr->value();
   __ Move(result, v);
 }