LLVM v9.8.0

Diff since v9.7.1

Merged pull requests:

• Bump actions/github-script from 8 to 9 (#554) (@dependabot[bot])
• Support handling new attributes (#556) (@vchuravy)
• Bump version and LLVMExtra (#558) (@vchuravy)

Closed issues:

• Segmentation fault when running NewPM (#528)