Zero build failure with clang due to values not handled in switch

```
* For target hotspot_variant-zero_libjvm_objs_bytecodeInterpreter.o:
/jdk/src/hotspot/share/interpreter/zero/bytecodeInterpreter.cpp:2971:13: error: 7 enumeration values not handled in switch: 'T_VOID', 'T_ADDRESS', 'T_NARROWOOP'... [-Werror,-Wswitch]
    switch (istate->method()->result_type()) {
            ^
/jdk/src/hotspot/share/interpreter/zero/bytecodeInterpreter.cpp:2971:13: note: add missing switch cases
    switch (istate->method()->result_type()) {
            ^
/jdk/src/hotspot/share/interpreter/zero/bytecodeInterpreter.cpp:2971:13: error: 7 enumeration values not handled in switch: 'T_VOID', 'T_ADDRESS', 'T_NARROWOOP'... [-Werror,-Wswitch]
    switch (istate->method()->result_type()) {
            ^
/jdk/src/hotspot/share/interpreter/zero/bytecodeInterpreter.cpp:2971:13: note: add missing switch cases
    switch (istate->method()->result_type()) {
            ^
/jdk/src/hotspot/share/interpreter/zero/bytecodeInterpreter.cpp:2971:13: error: 7 enumeration values not handled in switch: 'T_VOID', 'T_ADDRESS', 'T_NARROWOOP'... [-Werror,-Wswitch]
    switch (istate->method()->result_type()) {
            ^
   ... (rest of output omitted)
```

```
* For target hotspot_variant-zero_libjvm_objs_zeroInterpreter_zero.o:
/jdk/src/hotspot/cpu/zero/zeroInterpreter_zero.cpp:615:11: error: 10 enumeration values not handled in switch: 'btos', 'ztos', 'ctos'... [-Werror,-Wswitch]
  switch (entry->flag_state()) {
          ^
/jdk/src/hotspot/cpu/zero/zeroInterpreter_zero.cpp:615:11: note: add missing switch cases
  switch (entry->flag_state()) {
          ^
1 error generated.
```