[Strings] Add string proposal types (#4755)

This starts to implement the Wasm Strings proposal

https://github.com/WebAssembly/stringref/blob/main/proposals/stringref/Overview.md

This just adds the types.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/wasm-type.h b/src/wasm-type.h
index 6b1608ddc..23e559aad 100644
--- a/src/wasm-type.h
+++ b/src/wasm-type.h
@@ -109,6 +109,7 @@ public:
     funcref,
     anyref,
     eqref,
+    // From here types are non-nullable.
     i31ref,
     dataref,
   };
@@ -342,8 +343,12 @@ public:
     eq,
     i31,
     data,
+    string,
+    stringview_wtf8,
+    stringview_wtf16,
+    stringview_iter,
   };
-  static constexpr BasicHeapType _last_basic_type = data;
+  static constexpr BasicHeapType _last_basic_type = stringview_iter;
 
   // BasicHeapType can be implicitly upgraded to HeapType
   constexpr HeapType(BasicHeapType id) : id(id) {}