[mlir] don't incorrectly bail from alias analysis #4276

Job	Run time
Enzyme CI LLVM 11 Release macOS	6m 51s
Enzyme CI LLVM 11 Release ubuntu-20.04	4m 17s
Enzyme CI LLVM 11 Debug macOS	9m 48s
Enzyme CI LLVM 11 Debug ubuntu-20.04	3m 48s
Enzyme CI LLVM 12 Release macOS	6m 56s
Enzyme CI LLVM 12 Release ubuntu-20.04	4m 23s
Enzyme CI LLVM 12 Debug macOS	6m 45s
Enzyme CI LLVM 13 Release macOS XCode	8m 35s
Enzyme CI LLVM 12 Debug ubuntu-20.04	3m 50s
Enzyme CI LLVM 13 Release macOS	11m 8s
Enzyme CI LLVM 13 Release ubuntu-20.04	4m 23s
Enzyme CI LLVM 13 Debug macOS	5m 26s
Enzyme CI LLVM 13 Debug ubuntu-20.04	3m 57s
Enzyme CI LLVM 14 Release macOS	10m 39s
Enzyme CI LLVM 14 Release ubuntu-20.04	4m 40s
Enzyme CI LLVM 14 Debug macOS	5m 13s
Enzyme CI LLVM 14 Debug ubuntu-20.04	3m 54s
Enzyme CI LLVM 15 Release macOS	9m 2s
Enzyme CI LLVM 15 Release ubuntu-20.04	4m 26s
Enzyme CI LLVM 15 Debug macOS	7m 58s
Enzyme CI LLVM 15 Debug ubuntu-20.04	3m 57s
Enzyme CI LLVM 16 Release ubuntu-20.04	4m 29s
Enzyme CI LLVM 16 Debug ubuntu-20.04	3m 48s
	2h 18m 13s

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