Remove llvm_enzyme feature outside of bootstrap#158460
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r? bjorn3
I think you were the one who did the last refactoring on how we pass this feature.
We originally introduced and used this compile-time cfg since we were suspecting that some of the work we did for autodiff was causing a compile time regression even when no autodiff was used. It turned out later that we just did extra work due to a bug, which was fixed.
Thanks to the dlopen work our checks are now much simpler. We only do autodiff work if the -Zautodiff=Enable flag was set. If the flag is set we also just check if libEnzyme is in the sysroot, and if we can not find it, we error out.
Blocked on #158333, where I first fix the aforementioned check (I noticed this cleanup chance while working on it).