[LLDB] Fix crash when printing a struct with a static signed char member

[LLDB] Fix crash when printing a struct with a static signed char member

As with static bool for whatever reason printing them on their own
worked fine but wasn't handled when you printed the whole type.

I don't see a good way to test this from clang's side so our existing
tests will have to do.

We can now print all of the struct "A", so there's no need for a separate
one for static bool testing. I've not checked the output, just that it
succeeds. This saves us having to handle different min/max between systems.

Depends on D135169

Reviewed By: aeubanks, shafik

Differential Revision: https://reviews.llvm.org/D135170