PropertyDetails cleanup: NORMAL property type merged with FIELD.

src/mips64/macro-assembler-mips64.cc

Index: src/mips64/macro-assembler-mips64.cc
diff --git a/src/mips64/macro-assembler-mips64.cc b/src/mips64/macro-assembler-mips64.cc
index 466906ae2daa907036524ac296c929c352fa3f90..45b190b5363713c93692623e5377d0c1be9ae5f0 100644
--- a/src/mips64/macro-assembler-mips64.cc
+++ b/src/mips64/macro-assembler-mips64.cc
@@ -595,11 +595,12 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
   }
 
   bind(&done);
-  // Check that the value is a normal property.
+  // Check that the value is a field property.
   // reg2: elements + (index * kPointerSize).
   const int kDetailsOffset =
       SeededNumberDictionary::kElementsStartOffset + 2 * kPointerSize;
   ld(reg1, FieldMemOperand(reg2, kDetailsOffset));
+  DCHECK_EQ(FIELD, 0);
   And(at, reg1, Operand(Smi::FromInt(PropertyDetails::TypeField::kMask)));
   Branch(miss, ne, at, Operand(zero_reg));