LLVM v9.4.5

Diff since v9.4.4

Merged pull requests:

• Bump peter-evans/find-comment from 3 to 4 (#529) (@dependabot[bot])
• Bump peter-evans/create-or-update-comment from 4 to 5 (#530) (@dependabot[bot])
• Bump actions/checkout from 5 to 6 (#532) (@dependabot[bot])
• Catch custom pass exceptions to avoid confusing LLVM. (#534) (@maleadt)