deps backport 7c3748a from upstream V8

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 5
 #define V8_MINOR_VERSION 1
 #define V8_BUILD_NUMBER 281
-#define V8_PATCH_LEVEL 89
+#define V8_PATCH_LEVEL 90
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/src/runtime/runtime-debug.cc

@@ -584,7 +584,8 @@ RUNTIME_FUNCTION(Runtime_GetFrameDetails) {
     // Use the value from the stack.
     if (scope_info->LocalIsSynthetic(i)) continue;
     locals->set(local * 2, scope_info->LocalName(i));
-    Handle<Object> value = frame_inspector.GetExpression(i);
+    Handle<Object> value =
+        frame_inspector.GetExpression(scope_info->StackLocalIndex(i));
     // TODO(yangguo): We convert optimized out values to {undefined} when they
     // are passed to the debugger. Eventually we should handle them somehow.
     if (value->IsOptimizedOut()) value = isolate->factory()->undefined_value();

deps/v8/test/mjsunit/regress/regress-5071.js

@@ -0,0 +1,26 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --expose-debug-as debug
+
+var Debug = debug.Debug;
+
+function listener(event, exec_state, event_data, data) {
+  assertEquals(2, exec_state.frameCount());
+  assertEquals("a", exec_state.frame(0).localName(0));
+  assertEquals("1", exec_state.frame(0).localValue(0).value());
+  assertEquals(1, exec_state.frame(0).localCount());
+}
+
+Debug.setListener(listener);
+
+function f() {
+  var a = 1;
+  {
+    let b = 2;
+    debugger;
+  }
+}
+
+f();