8033990: Add message to verbose output to indicate when JVM was unable to use shared archive (with -Xshare:auto)

Added message to indicate when sharing was attempted but failed

Reviewed-by: coleenp, ctornqvi

hotspot/src/share/vm/memory/filemap.cpp

@@ -78,6 +78,10 @@ void FileMapInfo::fail_continue(const char *msg, ...) {
   va_start(ap, msg);
   if (RequireSharedSpaces) {
     fail(msg, ap);
+  } else {
+    if (PrintSharedSpaces) {
+      tty->print_cr("UseSharedSpaces: %s", msg);
+    }
   }
   va_end(ap);
   UseSharedSpaces = false;