Revert "Temporarily disable -Zrandomize-layout due to rustc ICE"

Fixed in nightly-2023-07-23.

This reverts commit 4a7ca54.

Author: dtolnay

.github/workflows/ci.yml

@@ -33,7 +33,7 @@ jobs:
           toolchain: ${{matrix.rust}}
       - name: Enable type layout randomization
         run: echo RUSTFLAGS=${RUSTFLAGS}\ -Zrandomize-layout >> $GITHUB_ENV
-        if: matrix.rust == 'nightly' && false # FIXME https://github.com/rust-lang/rust/issues/113941
+        if: matrix.rust == 'nightly'
       - run: cargo check
       - run: cargo test --workspace
         if: matrix.rust != '1.56.0'