Merge pull request #32 from WebAssembly/update-impl-status

Two small updates to the overview's implementation status section

Author: fitzgen

proposals/custom-page-sizes/Overview.md

@@ -417,7 +417,9 @@ Engines:
 
 Toolchains:
 
+* [ ] [Binaryen and `wasm-opt`](https://github.com/WebAssembly/binaryen/issues/6873)
 * [ ] `wasm-ld` in LLVM
+* [x] [The Virgil language toolchain](https://github.com/titzer/virgil/pull/272)
 
 Binary decoders: