The Giants have shaken things up amid their current six-game losing streak.Following a brutal road trip in Philadelphia and Tampa Bay, San Francisco is calling up top prospect Bryce Eldridge and catcher Jesús Rodríguez, sources confirmed to Alex Pavlovic and NBC Sports Bay Area.With the roster makeover, Giants broadcaster Mike Krukow believes there could be more changes coming if San Francisco continues to struggle.“I don’t think anybody is safe right now,” Krukow said Monday on KNBR’s “Murph & Markus” show. “I really don’t. I mean, if you think that the numbers you’re putting out now, if they’re not good numbers, you cannot justify the argument to say that I need to be in the lineup.“However, when you do get that chance to play, then you need to perform. It’s that simple, and it applies to everybody, even a two-time Gold Glove catcher. And there just aren’t any guarantees, and that is what a shake-up is. I mean, you’re shaking things up. You have to be willing as an organization to say that it applies to everybody. I certainly feel that is what’s going on here.”During...