GitHub Workflow Fails with LLVM 14

[Vipul-Cariappa]

I am adding GitHub workflow to run LLVM related tests with other versions of LLVM that are supported by LFortran (PR: #2754).
But the tests fail with a segfault when using LLVM 14. It passes with LLVM 10, 11, 15 & 16.

[certik]

If that's the case, then we need to test every single LLVM version between 10 - 18. I was hoping we could perhaps skip some, but I guess we cannot.