Reproduce:
 - Build without cds or g1gc; or on x86_32

Symptom
```
* For target hotspot_variant-server_libjvm_objs_javaClasses.o:
/home/jdk/src/hotspot/share/classfile/javaClasses.cpp:903:13: error: 'void initialize_static_field_for_dump(fieldDescriptor*, Handle)' defined but not used [-Werror=unused-function]
 static void initialize_static_field_for_dump(fieldDescriptor* fd, Handle mirror) {
             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* For target hotspot_variant-server_libjvm_objs_javaClasses.o:
./src/hotspot/share/classfile/javaClasses.cpp:844:13: error: 'void initialize_static_string_field_for_dump(fieldDescriptor*, Handle)' defined but not used [-Werror=unused-function]
 static void initialize_static_string_field_for_dump(fieldDescriptor* fd, Handle mirror) {
             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```