threads: use 0x24 to encode thread.spawn_indirect

This encoding change is necessary due to recent additions to the
component model; see [bytecodealliance#447].

[bytecodealliance#447]: WebAssembly/component-model#447

Author: abrown

crates/wasm-encoder/src/component/canonicals.rs

@@ -170,7 +170,7 @@ impl CanonicalFunctionSection {
     /// Defines a function which will spawn a new thread by invoking a shared
     /// function indirectly through a `funcref` table.
     pub fn thread_spawn_indirect(&mut self, table_index: u32) -> &mut Self {
-        self.bytes.push(0x07);
+        self.bytes.push(0x24);
         table_index.encode(&mut self.bytes);
         self.num_added += 1;
         self

crates/wasmparser/src/readers/component/canonicals.rs

@@ -285,7 +285,7 @@ impl<'a> FromReader<'a> for CanonicalFunction {
             0x05 => CanonicalFunction::ThreadSpawn {
                 func_ty_index: reader.read()?,
             },
-            0x07 => CanonicalFunction::ThreadSpawnIndirect {
+            0x24 => CanonicalFunction::ThreadSpawnIndirect {
                 table_index: reader.read()?,
             },
             0x06 => CanonicalFunction::ThreadHwConcurrency,