[Isolate] Fix Isolate::PrintCurrentStackTrace for interpreted frames

Previously we were getting the code object from the stack, so printed incorrect
position details for interpreted frames.

BUG=v8:7916

Change-Id: I2f87584117d88b7db3f3b9bdbfe793c4d3e33fe9
Reviewed-on: https://chromium-review.googlesource.com/1126313Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54253}

src/isolate.cc

@@ -1671,8 +1671,17 @@ void Isolate::PrintCurrentStackTrace(FILE* out) {
 
     Handle<Object> receiver(frame->receiver(), this);
     Handle<JSFunction> function(frame->function(), this);
-    Handle<AbstractCode> code(AbstractCode::cast(frame->LookupCode()), this);
-    const int offset = static_cast<int>(frame->pc() - code->InstructionStart());
+    Handle<AbstractCode> code;
+    int offset;
+    if (frame->is_interpreted()) {
+      InterpretedFrame* interpreted_frame = InterpretedFrame::cast(frame);
+      code = handle(AbstractCode::cast(interpreted_frame->GetBytecodeArray()),
+                    this);
+      offset = interpreted_frame->GetBytecodeOffset();
+    } else {
+      code = handle(AbstractCode::cast(frame->LookupCode()), this);
+      offset = static_cast<int>(frame->pc() - code->InstructionStart());
+    }
 
     JSStackFrame site(this, receiver, function, code, offset);
     Handle<String> line = site.ToString().ToHandleChecked();