[lldb] Allow to register frame recognizers applied beyond the first instruction

It is currently possible to register a frame recognizer, but it will be applied if and only if the frame's PC points to the very first instruction of the specified function, which limits usability of this feature.

The implementation already supports changing this behaviour by passing an additional flag, but it's not possible to set it via the command interface. Fix that.

Reviewed By: jingham

Differential Revision: https://reviews.llvm.org/D108510