[cleanup] Teach HeapObjectShortPrint() about the context types.

Properly print the new context types in HeapObjectShortPrint() so we see
what kind of context it is, and the number of context slots.

Bug: v8:7570, v8:7588
Change-Id: I43414996fd953f77e140e8750b2dc4923c9bce95
Reviewed-on: https://chromium-review.googlesource.com/986135Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52297}

src/objects.cc

@@ -3275,6 +3275,34 @@ void HeapObject::HeapObjectShortPrint(std::ostream& os) {  // NOLINT
       }
       os << ">";
     } break;
+    case BLOCK_CONTEXT_TYPE:
+      os << "<BlockContext[" << FixedArray::cast(this)->length() << "]>";
+      break;
+    case CATCH_CONTEXT_TYPE:
+      os << "<CatchContext[" << FixedArray::cast(this)->length() << "]>";
+      break;
+    case DEBUG_EVALUATE_CONTEXT_TYPE:
+      os << "<DebugEvaluateContext[" << FixedArray::cast(this)->length()
+         << "]>";
+      break;
+    case EVAL_CONTEXT_TYPE:
+      os << "<EvalContext[" << FixedArray::cast(this)->length() << "]>";
+      break;
+    case FUNCTION_CONTEXT_TYPE:
+      os << "<FunctionContext[" << FixedArray::cast(this)->length() << "]>";
+      break;
+    case MODULE_CONTEXT_TYPE:
+      os << "<ModuleContext[" << FixedArray::cast(this)->length() << "]>";
+      break;
+    case NATIVE_CONTEXT_TYPE:
+      os << "<NativeContext[" << FixedArray::cast(this)->length() << "]>";
+      break;
+    case SCRIPT_CONTEXT_TYPE:
+      os << "<ScriptContext[" << FixedArray::cast(this)->length() << "]>";
+      break;
+    case WITH_CONTEXT_TYPE:
+      os << "<WithContext[" << FixedArray::cast(this)->length() << "]>";
+      break;
     case HASH_TABLE_TYPE:
       os << "<HashTable[" << FixedArray::cast(this)->length() << "]>";
       break;