Bug 1847239 - wasm: Reset non-nullable local state when using delegate to end try. r=jseward

A try block can end with 'delegate' instead of 'end'. We need to unset the nnl state
the same way in both.

Differential Revision: https://phabricator.services.mozilla.com/D185439

js/src/jit-test/tests/wasm/function-references/nnl-test.js

@@ -10,6 +10,7 @@ const KINDS = [
   "loop",
   "try",
   "catch",
+  "delegate",
   "if",
   "else",
 ]
@@ -41,6 +42,9 @@ function generateBlock(kind, contents) {
     case "catch": {
       return `try\ncatch_all\n${contents}end\n`
     }
+    case "delegate": {
+      return `try\n${contents}\ndelegate 0\n`
+    }
     case "if": {
       return `i32.const 0\nif\n${contents}end\n`
     }

js/src/wasm/WasmOpIter.h

@@ -1724,6 +1724,7 @@ inline void OpIter<Policy>::popDelegate() {
   MOZ_ASSERT(Classify(op_) == OpKind::Delegate);
 
   controlStack_.popBack();
+  unsetLocals_.resetToBlock(controlStack_.length());
 }
 
 template <typename Policy>