Support disabling llvm path #5312

Job	Run time
Enzyme CI LLVM 11 Release ubuntu-20.04	4m 23s
Enzyme CI LLVM 11 Debug ubuntu-20.04	3m 49s
Enzyme CI LLVM 12 Release ubuntu-20.04	4m 34s
Enzyme CI LLVM 12 Release macOS	49s
Enzyme CI LLVM 12 Debug ubuntu-20.04	3m 58s
Enzyme CI LLVM 12 Debug macOS	52s
Enzyme CI LLVM 13 Release ubuntu-20.04	4m 25s
Enzyme CI LLVM 13 Release macOS	29s
Enzyme CI LLVM 13 Debug ubuntu-20.04	3m 55s
Enzyme CI LLVM 13 Debug macOS	45s
Enzyme CI LLVM 13 Release macOS XCode	40s
Enzyme CI LLVM 14 Release ubuntu-20.04	4m 38s
Enzyme CI LLVM 14 Release macOS	34s
Enzyme CI LLVM 14 Debug ubuntu-20.04	3m 58s
Enzyme CI LLVM 14 Debug macOS	39s
Enzyme CI LLVM 15 Release ubuntu-20.04	5m 13s
Enzyme CI LLVM 15 Debug ubuntu-20.04	4m 6s
Enzyme CI LLVM 15 Release macOS	18s
Enzyme CI LLVM 15 Debug macOS	19s
Enzyme CI LLVM 16 Release ubuntu-20.04	4m 20s
Enzyme CI LLVM 16 Release macOS	42s
Enzyme CI LLVM 16 Debug macOS	41s
Enzyme CI LLVM 16 Debug ubuntu-20.04	3m 51s
	57m 58s

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