Replace HeapType with a non-templated FieldType class.

src/ic/arm64/handler-compiler-arm64.cc

Index: src/ic/arm64/handler-compiler-arm64.cc
diff --git a/src/ic/arm64/handler-compiler-arm64.cc b/src/ic/arm64/handler-compiler-arm64.cc
index 84736509d70c558c70fd5d4de52c19ae03b29398..f4ad0b3b7449e5c55a21bbc56d863625cd9d02d7 100644
--- a/src/ic/arm64/handler-compiler-arm64.cc
+++ b/src/ic/arm64/handler-compiler-arm64.cc
@@ -441,8 +441,7 @@ void NamedStoreHandlerCompiler::GenerateConstantCheck(Register map_reg,
   __ B(ne, miss_label);
 }
 
-
-void NamedStoreHandlerCompiler::GenerateFieldTypeChecks(HeapType* field_type,
+void NamedStoreHandlerCompiler::GenerateFieldTypeChecks(FieldType* field_type,
                                                         Register value_reg,
                                                         Label* miss_label) {
   Register map_reg = scratch1();
@@ -450,7 +449,7 @@ void NamedStoreHandlerCompiler::GenerateFieldTypeChecks(HeapType* field_type,
   DCHECK(!value_reg.is(map_reg));
   DCHECK(!value_reg.is(scratch));
   __ JumpIfSmi(value_reg, miss_label);
-  HeapType::Iterator<Map> it = field_type->Classes();
+  FieldType::Iterator it = field_type->Classes();
   if (!it.Done()) {
     __ Ldr(map_reg, FieldMemOperand(value_reg, HeapObject::kMapOffset));
     Label do_store;