Workaround for rustc issue rust-lang/rust#111888

See: rust-lang/rust#111888 (comment)

Author: fpoli

Cargo.toml

@@ -36,6 +36,6 @@ debug = 1
 [profile.release]
 # Enable after fixing https://github.com/viperproject/prusti-dev/issues/383
 # lto = true
-# codegen-units = 1
+codegen-units = 1
 # Enable when profiling
 # debug = true

prusti-contracts/Cargo.toml

@@ -10,3 +10,6 @@ resolver = "2"
 # This should not be built as part of Prusti (instead being build by `prusti-contracts-build`)
 # It would require setting the `build.rustc-wrapper` in a `../.cargo/config.toml` correctly
 # But it's unclear how to figure out if we're doing a debug or release build there
+
+[profile.release]
+codegen-units = 1