Auto merge of #136428 - EnzymeAD:enable-autodiff, r=<try>

test building enzyme in CI

We will later need to make it more granular before merging, but let's start by figuring out how many things we break right now in the first place.

For now I modified `src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile`, so let's try that dist job first.

try-job: dist-x86_64-linux

r? `@oli-obk`

Tracking:

- #124509

Author: bors

Diff for: config.example.toml

@@ -79,10 +79,10 @@
 #tests = false
 
 # Indicates whether the LLVM plugin is enabled or not
-#plugins = false
+#plugins = true
 
 # Whether to build Enzyme as AutoDiff backend.
-#enzyme = false
+#enzyme = true
 
 # Whether to build LLVM with support for it's gpu offload runtime.
 #offload = false

Diff for: src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile

@@ -89,6 +89,8 @@ ENV RUST_CONFIGURE_ARGS \
       --set target.x86_64-unknown-linux-gnu.ar=/rustroot/bin/llvm-ar \
       --set target.x86_64-unknown-linux-gnu.ranlib=/rustroot/bin/llvm-ranlib \
       --set llvm.thin-lto=true \
+      --set llvm.plugins=true \
+      --set llvm.enzyme=true \
       --set llvm.ninja=false \
       --set llvm.libzstd=true \
       --set rust.jemalloc \