Revert of Use a custom Struct for stack trace storage

src/runtime/runtime-internal.cc

Index: src/runtime/runtime-internal.cc
diff --git a/src/runtime/runtime-internal.cc b/src/runtime/runtime-internal.cc
index c1e90b24dc37e4d12dbd13b841185e669a92008f..5b46b974a5e397758fa65072987b334b6be5a71a 100644
--- a/src/runtime/runtime-internal.cc
+++ b/src/runtime/runtime-internal.cc
@@ -115,27 +115,22 @@
   // TODO(wasm): This implementation is temporary, see bug #5007:
   // https://bugs.chromium.org/p/v8/issues/detail?id=5007
   Handle<JSObject> error = Handle<JSObject>::cast(error_obj);
-
-  // Patch the stack trace (array of <receiver, function, code, position>).
-
   Handle<Object> stack_trace_obj = JSReceiver::GetDataProperty(
       error, isolate->factory()->stack_trace_symbol());
+  // Patch the stack trace (array of <receiver, function, code, position>).
   if (stack_trace_obj->IsJSArray()) {
     Handle<FixedArray> stack_elements(
         FixedArray::cast(JSArray::cast(*stack_trace_obj)->elements()));
-    Handle<StackTraceFrame> frame =
-        handle(StackTraceFrame::cast(stack_elements->get(0)));
-
-    DCHECK(frame->IsWasmFrame());
-    DCHECK(frame->offset() >= 0);
-    frame->set_offset(-1 - byte_offset);
-  }
-
+    DCHECK_EQ(1, stack_elements->length() % 4);
+    DCHECK(Code::cast(stack_elements->get(3))->kind() == Code::WASM_FUNCTION);
+    DCHECK(stack_elements->get(4)->IsSmi() &&
+           Smi::cast(stack_elements->get(4))->value() >= 0);
+    stack_elements->set(4, Smi::FromInt(-1 - byte_offset));
+  }
+  Handle<Object> detailed_stack_trace_obj = JSReceiver::GetDataProperty(
+      error, isolate->factory()->detailed_stack_trace_symbol());
   // Patch the detailed stack trace (array of JSObjects with various
   // properties).
-
-  Handle<Object> detailed_stack_trace_obj = JSReceiver::GetDataProperty(
-      error, isolate->factory()->detailed_stack_trace_symbol());
   if (detailed_stack_trace_obj->IsJSArray()) {
     Handle<FixedArray> stack_elements(
         FixedArray::cast(JSArray::cast(*detailed_stack_trace_obj)->elements()));