LLDB command line installation on macOS Big Sur edition (11.0) beta
This is fixed on macOS 11.1 BuildVersion 20C69 (and likely before now just I haven’t tried sooner to reproduce your issue).
You need to run the following:
xcode-select --install
sudo xcode-xelect -license

Press space to get to the end of the license and type agree.
Then open Applications folder and drag the calculator app icon into your command line window after typing lldb:
mike@m1 ~ % lldb /System/Applications/Calculator.app 
objc[17521]: Class AMSupportURLConnectionDelegate is implemented in both ?? (0x206a678f0) and ?? (0x1163582b8). One of the two will be used. Which one is undefined.
objc[17521]: Class AMSupportURLSession is implemented in both ?? (0x206a67940) and ?? (0x116358308). One of the two will be used. Which one is undefined.
(lldb) target create &quot;/System/Applications/Calculator.app&quot;
Current executable set to '/System/Applications/Calculator.app' (arm64e).
(lldb) exit