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

Fixed in nightly-2023-07-23.

This reverts commit 41b23f2.

Author: dtolnay

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
           components: rust-src
       - name: Enable type layout randomization
         run: echo RUSTFLAGS=${RUSTFLAGS}\ -Zrandomize-layout >> $GITHUB_ENV
-        if: matrix.rust == 'nightly' && false # FIXME https://github.com/rust-lang/rust/issues/113941
+        if: matrix.rust == 'nightly'
       - name: Enable nightly-only tests
         run: echo RUSTFLAGS=${RUSTFLAGS}\ --cfg=thiserror_nightly_testing >> $GITHUB_ENV
         if: matrix.rust == 'nightly'