If the type being switched on is 'char'/'wchar' then the switch cases should be shown as char constants

[plafosse]

Consider the following switch statement:

In this case since the type being switched on is char we should be able to display the case labels as char as well.

[xusheng6]

This can be handled in the very same was as we handle enum values

[emesare]

Propagating the type to the case expression constants is easy enough like @xusheng6 said however the char type is in fact, not a type, but the textual representation of int8_t. We can either:

1. Just do this and be ok with non-char int8_t types having their display type changed to a constant character display type.
2. Make a separate char type.

[emesare]

Blocking on: #5355