VM_Address getNextReturnAddressAddress() {
VM_Address getNextReturnAddressAddress() { VM_Address  ref_address; if ( !jniSavedReturnAddr.isZero() ) { ref_address = jniSavedReturnAddr; jniSavedReturnAddr = VM_Address.zero(); return ref_address; }
   VM_Address getNextReturnAddressAddress() { //- implements VM_GCMapIterator       VM_Address  ref_address;       if ( !jniSavedReturnAddr.isZero() ) {          ref_address = jniSavedReturnAddr;          jniSavedReturnAddr = VM_Address.zero();          return ref_address;      }      return VM_Address.zero();      }