[wasm] Improve naming consistency for WASM instances.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index f852ca0de39dee015d82e03b5f7f326910688c56..7c46f800e48df19b780a8119ad70cd3f182e45b0 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -10339,14 +10339,14 @@ Handle<FrameArray> FrameArray::AppendJSFrame(Handle<FrameArray> in,
 
 // static
 Handle<FrameArray> FrameArray::AppendWasmFrame(Handle<FrameArray> in,
-                                               Handle<Object> wasm_object,
+                                               Handle<Object> wasm_instance,
                                                int wasm_function_index,
                                                Handle<AbstractCode> code,
                                                int offset, int flags) {
   const int frame_count = in->FrameCount();
   const int new_length = LengthFor(frame_count + 1);
   Handle<FrameArray> array = EnsureSpace(in, new_length);
-  array->SetWasmObject(frame_count, *wasm_object);
+  array->SetWasmInstance(frame_count, *wasm_instance);
   array->SetWasmFunctionIndex(frame_count, Smi::FromInt(wasm_function_index));
   array->SetCode(frame_count, *code);
   array->SetOffset(frame_count, Smi::FromInt(offset));