Typed Continuations: Add cont type (#5998)

This PR is part of a series that adds basic support for the [typed continuations proposal](https://github.com/wasmfx/specfx).

This PR adds continuation types, of the form `(cont $foo)` for some function type `$foo`.

The only notable changes affecting existing code are the following:
- This is the first `HeapType` which has another `HeapType` (rather than, say, a `Type`) as its immediate child. This required fixes to certain traversals that have a flag for being at the toplevel of a type.
- Some shared logic for parsing `HeapType`s has been factored out.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/wasm/wasm.cpp b/src/wasm/wasm.cpp
index e5f3deb33..fef613cd2 100644
--- a/src/wasm/wasm.cpp
+++ b/src/wasm/wasm.cpp
@@ -60,6 +60,7 @@ Name MODULE("module");
 Name START("start");
 Name GLOBAL("global");
 Name FUNC("func");
+Name CONT("cont");
 Name PARAM("param");
 Name RESULT("result");
 Name MEMORY("memory");