[wasm] Enforce that function bodies end with the \"end\" opcode.

test/cctest/wasm/test-run-wasm.cc

Index: test/cctest/wasm/test-run-wasm.cc
diff --git a/test/cctest/wasm/test-run-wasm.cc b/test/cctest/wasm/test-run-wasm.cc
index 1686352b637887c25d7f8a34aa791827e28824c8..2fa1c10f660e825a86c475807efd003e635644bb 100644
--- a/test/cctest/wasm/test-run-wasm.cc
+++ b/test/cctest/wasm/test-run-wasm.cc
@@ -1851,13 +1851,19 @@ static void TestBuildGraphForSimpleExpression(WasmOpcode opcode) {
   FunctionSig* sig = WasmOpcodes::Signature(opcode);
 
   if (sig->parameter_count() == 1) {
-    byte code[] = {WASM_NO_LOCALS, kExprGetLocal, 0, static_cast<byte>(opcode)};
+    byte code[] = {WASM_NO_LOCALS, kExprGetLocal, 0, static_cast<byte>(opcode),
+                   WASM_END};
     TestBuildingGraph(&zone, &jsgraph, nullptr, sig, nullptr, code,
                       code + arraysize(code));
   } else {
     CHECK_EQ(2, sig->parameter_count());
-    byte code[] = {WASM_NO_LOCALS,           kExprGetLocal, 0, kExprGetLocal, 1,
-                   static_cast<byte>(opcode)};
+    byte code[] = {WASM_NO_LOCALS,
+                   kExprGetLocal,
+                   0,
+                   kExprGetLocal,
+                   1,
+                   static_cast<byte>(opcode),
+                   WASM_END};
     TestBuildingGraph(&zone, &jsgraph, nullptr, sig, nullptr, code,
                       code + arraysize(code));
   }