Accept Proxy in d8.test.verfiySourcePositions

If a Proxy is passed as argument to d8.test.verifySourcePositions,
unwrap the target function.

Bug: chromium:1186491
Change-Id: Iaacbf800f023121a07035a88745919df68f79217
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2748081Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Patrick Thier <pthier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73398}

src/d8/d8.cc

@@ -1769,10 +1769,13 @@ void Shell::TestVerifySourcePositions(
     Throw(isolate, "Expected function as single argument.");
     return;
   }
+  Local<Value> arg_fun = args[0];
+  while (arg_fun->IsProxy()) arg_fun = arg_fun.As<Proxy>()->GetTarget();
+
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   HandleScope handle_scope(isolate);
   i::Handle<i::JSFunction> function =
-      i::Handle<i::JSFunction>::cast(Utils::OpenHandle(*args[0]));
+      i::Handle<i::JSFunction>::cast(Utils::OpenHandle(*arg_fun));
   if (!function->shared().HasBytecodeArray()) {
     Throw(isolate, "Function has no BytecodeArray attached.");
     return;

test/mjsunit/baseline/verify-bytecode-offsets.js

@@ -29,3 +29,5 @@ obj.foo = 'bar';
 foo(obj, obj);
 
 d8.test.verifySourcePositions(foo);
+
+d8.test.verifySourcePositions(new Proxy(foo, {}));