Replace HeapType with a non-templated FieldType class.

src/ic/mips64/handler-compiler-mips64.cc

Index: src/ic/mips64/handler-compiler-mips64.cc
diff --git a/src/ic/mips64/handler-compiler-mips64.cc b/src/ic/mips64/handler-compiler-mips64.cc
index 05b48b7938ef1c95b37531fabbe6746251fe7801..44da111b9e8a64d129bfdd7f15e2839d7b7dc75d 100644
--- a/src/ic/mips64/handler-compiler-mips64.cc
+++ b/src/ic/mips64/handler-compiler-mips64.cc
@@ -383,8 +383,7 @@ void NamedStoreHandlerCompiler::GenerateConstantCheck(Register map_reg,
   __ Branch(miss_label, ne, value_reg, Operand(scratch));
 }
 
-
-void NamedStoreHandlerCompiler::GenerateFieldTypeChecks(HeapType* field_type,
+void NamedStoreHandlerCompiler::GenerateFieldTypeChecks(FieldType* field_type,
                                                         Register value_reg,
                                                         Label* miss_label) {
   Register map_reg = scratch1();
@@ -392,7 +391,7 @@ 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()) {
     __ ld(map_reg, FieldMemOperand(value_reg, HeapObject::kMapOffset));
     Label do_store;