[wasm-c-api] Fix component builds of wasm_api_tests

SignatureHelper::kMarker needs an explicit instantiation after
f3b4167f.

Change-Id: Ia5a0696a576a2c59bea262359058bd63eb3c8426
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2101004
Auto-Submit: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66701}

src/wasm/c-api.cc

@@ -1271,6 +1271,10 @@ class SignatureHelper : public i::AllStatic {
   }
 };
 
+// Explicit instantiation makes the linker happy for component builds of
+// wasm_api_tests.
+constexpr i::wasm::ValueType SignatureHelper::kMarker;
+
 auto make_func(Store* store_abs, FuncData* data) -> own<Func> {
   auto store = impl(store_abs);
   i::Isolate* isolate = store->i_isolate();