If C<$symbol> is Z-encoded as described in C<valgrind>'s F<include/pub_tool_redir.h>, extract and decode its function name part.
Otherwise, C<$symbol> is returned as is.
If C<$symbol> is Z-encoded as described in C<valgrind>'s F<include/pub_tool_redir.h>, extract and decode its function name part.
Otherwise, C<$symbol> is returned as is.