[lldb] [NFC] Update TestEarlyProcessLaunch to work on macOS 15

This test sets a breakpoint on malloc, as a way to stop early in
dyld's setting up code, before the system libraries are initialized
so we can confirm that we don't fetch the Objective-C class table
before it's initialized.

In macOS 15 (macOS Sonoma), dyld doesn't call malloc any longer,
so this heuristic/trick isn't working.  It does call other things
called *alloc though, so I'm changing this to use a regex breakpoint
on that, to keep the test working.

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