v9.1.3

LLVM v9.1.3

Diff since v9.1.2

Merged pull requests:

• Remove Requires dependency (#485) (@christiangnrd)
• Don't error on empty pass managers. (#488) (@maleadt)
• Simplify CI. (#489) (@maleadt)
• Switch CI to 1.11. (#490) (@maleadt)

Closed issues:

• Allow empty pass managers (#487)