Allow executing functions from Wasm modules that have failed linking

This is called for by the official spec test "linking". We keep the
check only for modules eval'ed with EvalReturnsInstance, where it is
possible for the embedder to obtain a WasmInstance that will fail
linking. Without EvalReturnsInstance, instances must pass linking before
they are returned to the embedder.

Author: jirkamarsik

wasm/src/org.graalvm.wasm/src/org/graalvm/wasm/nodes/WasmRootNode.java

@@ -84,7 +84,7 @@ public final void tryInitialize(WasmInstance instance) {
         // We want to ensure that linking always precedes the running of the WebAssembly code.
         // This linking should be as late as possible, because a WebAssembly context should
         // be able to parse multiple modules before the code gets run.
-        if (!instance.isLinkCompletedFastPath()) {
+        if (getContext().getContextOptions().evalReturnsInstance() && !instance.isLinkCompletedFastPath()) {
             nonLinkedProfile.enter();
             instance.store().linker().tryLinkFastPath(instance);
         }