8058345: Refactor native stack printing from vmError.cpp to debug.cpp to make it available in gdb as well

Also fix stack trace on x86 to enable walking of runtime stubs and native wrappers

Reviewed-by: kvn

hotspot/src/cpu/zero/vm/frame_zero.cpp

@@ -438,3 +438,10 @@ intptr_t *frame::initial_deoptimization_info() {
   // unused... but returns fp() to minimize changes introduced by 7087445
   return fp();
 }
+
+#ifndef PRODUCT
+// This is a generic constructor which is only used by pns() in debug.cpp.
+frame::frame(void* sp, void* fp, void* pc) {
+  Unimplemented();
+}
+#endif