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

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index 975262244736fd3320dece859354cea03872ddaa..ac8a7d3193b590f5a02b33b0e83fad6a7568a7af 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -3596,7 +3596,7 @@ void MacroAssembler::CheckMapDeprecated(Handle<Map> map,
   if (map->CanBeDeprecated()) {
     mov(scratch, Operand(map));
     ldr(scratch, FieldMemOperand(scratch, Map::kBitField3Offset));
-    tst(scratch, Operand(Smi::FromInt(Map::Deprecated::kMask)));
+    tst(scratch, Operand(Map::Deprecated::kMask));
     b(ne, if_deprecated);
   }
 }
@@ -3854,7 +3854,8 @@ void MacroAssembler::NumberOfOwnDescriptors(Register dst, Register map) {
 void MacroAssembler::EnumLength(Register dst, Register map) {
   STATIC_ASSERT(Map::EnumLengthBits::kShift == 0);
   ldr(dst, FieldMemOperand(map, Map::kBitField3Offset));
-  and_(dst, dst, Operand(Smi::FromInt(Map::EnumLengthBits::kMask)));
+  and_(dst, dst, Operand(Map::EnumLengthBits::kMask));
+  SmiTag(dst);
 }