[turbofan] Make Factory::NewNumber() always return the minus_zero_value.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 96883052dad1a9105cd23dd0e641952821fbc730..320e14ff07bcb0d8ca96caaad01bc48165c31ab4 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -1018,7 +1018,7 @@ Handle<Object> Factory::NewNumber(double value,
   // We need to distinguish the minus zero value and this cannot be
   // done after conversion to int. Doing this by comparing bit
   // patterns is faster than using fpclassify() et al.
-  if (IsMinusZero(value)) return NewHeapNumber(-0.0, IMMUTABLE, pretenure);
+  if (IsMinusZero(value)) return minus_zero_value();
 
   int int_value = FastD2IChecked(value);
   if (value == int_value && Smi::IsValid(int_value)) {