Fix tests of lookup table generator (#139463)
## Why
In
https://github.com/llvm/llvm-project/pull/113612/files#diff-ada12e18f3e902b41b6989b46455c4e32656276e59907026e2464cf57d10d583,
the parameter `qual_name` was introduced. However, the tests have not
been adopted accordingly and hence cannot be executed.
## What
Fix the execution of tests by providing the missing argument.
