Initial support for emitting unwinding information in perf jitdump.

src/wasm/wasm-module.cc

Index: src/wasm/wasm-module.cc
diff --git a/src/wasm/wasm-module.cc b/src/wasm/wasm-module.cc
index 386a9ce5af8a2994d11bd5182ed246e9950cd30d..d7c3ce41ba8a1ede2eeecae00dbc26ddacd236d2 100644
--- a/src/wasm/wasm-module.cc
+++ b/src/wasm/wasm-module.cc
@@ -261,7 +261,7 @@ Handle<Code> CreatePlaceholder(Factory* factory, uint32_t index,
   // the {constant_pool_offset} field of the code object.
   // TODO(titzer): placeholder code objects are somewhat dangerous.
   static byte buffer[] = {0, 0, 0, 0, 0, 0, 0, 0};  // fake instructions.
-  static CodeDesc desc = {buffer, 8, 8, 0, 0, nullptr};
+  static CodeDesc desc = {buffer, 8, 8, 0, 0, nullptr, nullptr, 0};
   Handle<Code> code = factory->NewCode(desc, Code::KindField::encode(kind),
                                        Handle<Object>::null());
   code->set_constant_pool_offset(static_cast<int>(index) + kPlaceholderMarker);