Add wasm-opt-for-rust-maintenance-9

maintenance_deliveries/wasm-opt-for-rust-maintenance-9.md

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+# Maintenance Delivery :mailbox:
+
+**The [invoice form :pencil:](https://docs.google.com/forms/d/e/1FAIpQLSfmNYaoCgrxyhzgoKQ0ynQvnNRoTmgApz9NrMp-hd8mhIiO0A/viewform) has been filled out correctly for this delivery**  
+
+* **Application Document:** https://github.com/w3f/Grants-Program/blob/master/applications/maintenance/wasm-opt-for-rust.md
+* **Delivery Number:** 9
+* **Delivery Date:** 2023/09/04
+
+
+**Context**
+
+We merged a big bugfix contribution -
+we weren't running any of the binaryen DWARF passes at all,
+and received a contribution to build, run and test them.
+We released wasm-opt crate 0.114.1 with that fix.
+We helped ink developers with a regression regarding sign-extension.
+We continued working with upstream binaryen on Unicode fixes.
+
+**Deliverables**
+
+Note: a full hourly accounting of work performed is included with the invoice.
+
+| Number | Deliverable | Link | Notes |
+| ------------- | ------------- | ------------- |------------- |
+| 1. | Discussion about the wasm sign-extension feature | https://github.com/paritytech/cargo-contract/issues/1239#issuecomment-1673837119 | |
+| 2. | PR to compile the binaryen DWARF passes | https://github.com/brson/wasm-opt-rs/pull/151 | |
+| 3. | wasm-opt 0.114.1 | https://crates.io/crates/wasm-opt/0.114.1 | |
+| 4. | Discussion of C++ build caching | https://github.com/brson/wasm-opt-rs/issues/148#issuecomment-1701536008 | |
+| 5. | Continued work on binaryen Unicode support | https://github.com/WebAssembly/binaryen/pull/5671#issuecomment-1701621675 | |
+
+**Additional Information**
+
+N/A