[wasm] Improve naming consistency for WASM instances.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 6e1959243b14a073d0f2346961295f405a20c22c..2888c64f1e52f47342f6e7a9c433e0516b312389 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -3144,7 +3144,7 @@ class FrameArray : public FixedArray {
                                           Handle<AbstractCode> code, int offset,
                                           int flags);
   static Handle<FrameArray> AppendWasmFrame(Handle<FrameArray> in,
-                                            Handle<Object> wasm_object,
+                                            Handle<Object> wasm_instance,
                                             int wasm_function_index,
                                             Handle<AbstractCode> code,
                                             int offset, int flags);
@@ -7092,9 +7092,9 @@ class Script: public Struct {
   // [source_mapping_url]: sourceMappingURL magic comment
   DECL_ACCESSORS(source_mapping_url, Object)
 
-  // [wasm_object]: the wasm object this script belongs to.
+  // [wasm_instance]: the wasm instance this script belongs to.
   // This must only be called if the type of this script is TYPE_WASM.
-  DECL_ACCESSORS(wasm_object, JSObject)
+  DECL_ACCESSORS(wasm_instance, JSObject)
 
   // [wasm_function_index]: the wasm function index this script belongs to.
   // This must only be called if the type of this script is TYPE_WASM.