Handle unsigned integer qualifiers

[carsonharmon]

This is just a 1 line fix that handles integer consts that have the unsigned modifier.

In LLVM 12, there are a few consts like 1U which the python script fails to parse, this just removes the U if it's present.

Let me know if there is something else you would like me to do in order for this to be merged.

Also thanks for open sourcing this project, it's very useful.

[aleclearmind]

Looks good! Squash the commits, use the 50/72 rule and initial capital and it can go in. Thanks!