Evaluation in LLDB: how to free memory allocated for variables $1, $2, $3 etc?

Question

Debugging

Introductory. If in the LLDB console on iOS run

(lldb) p/x $r1
(unsigned int) $1 = 0x07000006

(lldb) p/x $r1
(unsigned int) $2 = 0x07000006

(lldb) p/x $r1
(unsigned int) $3 = 0x07000006

...и т.д.

about 1500 times, then in the end we get an error:

error: Couldn't allocate space for the stack frame: Couldn't malloc: address space is full
Errored out in Execute, couldn't PrepareToExecuteJITExpression

The fact is that every time we execute p/x $r1 , the debugger evaluates (I don’t know the corresponding term in Russian, sorry) the $r1 expression , during which memory is allocated for the $N variable (where N=1,2, 3,... ). After a certain number of attempts, the memory runs out and we see an error message.
Actually the question is: Is it possible to somehow free the memory allocated by the debugger for the variables $1 , $2 , $3 , etc.? Is there some special command for this in LLDB (I didn’t find it in the documentation - maybe there is an undocumented one?) Or maybe a script can be written in Python and attached to LLDB?
Thank you.