Make BitField3 a raw uint32 field, and move to the start of the map.

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index f27927de96f3f1cca25e841129a27439d03f4ff8..14ac943fb0f273ea23118aae6df23b16a1e6a068 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -3330,7 +3330,7 @@ void MacroAssembler::CheckMapDeprecated(Handle<Map> map,
   if (map->CanBeDeprecated()) {
     mov(scratch, map);
     mov(scratch, FieldOperand(scratch, Map::kBitField3Offset));
-    and_(scratch, Immediate(Smi::FromInt(Map::Deprecated::kMask)));
+    and_(scratch, Immediate(Map::Deprecated::kMask));
     j(not_zero, if_deprecated);
   }
 }
@@ -3508,7 +3508,8 @@ void MacroAssembler::EnsureNotWhite(
 void MacroAssembler::EnumLength(Register dst, Register map) {
   STATIC_ASSERT(Map::EnumLengthBits::kShift == 0);
   mov(dst, FieldOperand(map, Map::kBitField3Offset));
-  and_(dst, Immediate(Smi::FromInt(Map::EnumLengthBits::kMask)));
+  and_(dst, Immediate(Map::EnumLengthBits::kMask));
+  SmiTag(dst);
 }