v7.0.0

LLVM v7.0.0

Diff since v6.6.3

Merged pull requests:

• LowerSIMDLoopPass is a Loop Pass in 1.10 (#398) (@vchuravy)
• Don't install handle_error during precompilation (#401) (@vchuravy)
• Use generate_isystem_symbols to ignore the symbols in -isystem headers (#402) (@Gnimuc)
• Bump julia-actions/setup-julia from 1 to 2 (#403) (@dependabot[bot])
• LLVM 17 enablement. (#404) (@maleadt)
• Update CI for LLVM 17. (#406) (@maleadt)