[lldb/crashlog] Create artificial frames for non-crashed scripted threads

This patch pipes down the `-a|--load-all` crashlog command option to the
Scripted Process initializer to load all the images used by crashed
process instead of only loading the images related to the crashed
thread.

This allows us to recreate artificial frames also for the non-crashed
scripted threads.

rdar://90396265

Differential Revision: https://reviews.llvm.org/D121826



Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>