[wasm] Minor fixes

Minor fixes of things found in the code walkthrough.

R=titzer@chromium.org

Bug: v8:8015
Change-Id: If28be312fb7b8e5add214161a98d25145cdf8de5
Reviewed-on: https://chromium-review.googlesource.com/1224433
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55873}

src/compiler/wasm-compiler.cc

@@ -4678,9 +4678,7 @@ class WasmWrapperGraphBuilder : public WasmGraphBuilder {
     // We are passing the raw arg_buffer here. To the GC and other parts, it
     // looks like a Smi (lowest bit not set). In the runtime function however,
     // don't call Smi::value on it, but just cast it to a byte pointer.
-    Node* parameters[] = {
-        jsgraph()->SmiConstant(func_index), arg_buffer,
-    };
+    Node* parameters[] = {jsgraph()->SmiConstant(func_index), arg_buffer};
     BuildCallToRuntime(Runtime::kWasmRunInterpreter, parameters,
                        arraysize(parameters));
 

src/wasm/wasm-objects.h

@@ -543,7 +543,7 @@ class WasmExportedFunctionData : public Struct {
 class WasmDebugInfo : public Struct, public NeverReadOnlySpaceObject {
  public:
   DECL_ACCESSORS(wasm_instance, WasmInstanceObject)
-  DECL_ACCESSORS(interpreter_handle, Object);
+  DECL_ACCESSORS(interpreter_handle, Object);  // Foreign or undefined
   DECL_ACCESSORS(interpreted_functions, FixedArray);
   DECL_OPTIONAL_ACCESSORS(locals_names, FixedArray)
   DECL_OPTIONAL_ACCESSORS(c_wasm_entries, FixedArray)