ART: Replace some '\n' with std::endl

Induce flushing the ostreams at strategic points to improve
log visibility.

Bug: 62337922
Test: m test-art-host
Change-Id: Ic4b4c698b568575b55160fff0ad5c31fa6b4018a

2 files changed, 3 insertions, 4 deletions

diff --git a/runtime/base/histogram-inl.h b/runtime/base/histogram-inl.h
index b28eb729d8..be2092040d 100644
--- a/runtime/base/histogram-inl.h
+++ b/runtime/base/histogram-inl.h
@@ -198,7 +198,7 @@ inline void Histogram<Value>::PrintConfidenceIntervals(std::ostream &os, double
                                                         kFractionalDigits)
      << "-" << FormatDuration(Percentile(per_1, data) * kAdjust, unit, kFractionalDigits) << " "
      << "Avg: " << FormatDuration(Mean() * kAdjust, unit, kFractionalDigits) << " Max: "
-     << FormatDuration(Max() * kAdjust, unit, kFractionalDigits) << "\n";
+     << FormatDuration(Max() * kAdjust, unit, kFractionalDigits) << std::endl;
 }
 
 template <class Value>
diff --git a/runtime/thread_list.cc b/runtime/thread_list.cc
index 5094189dfc..95aba79ed7 100644
--- a/runtime/thread_list.cc
+++ b/runtime/thread_list.cc
@@ -165,7 +165,7 @@ static void DumpUnattachedThread(std::ostream& os, pid_t tid, bool dump_native_s
   if (dump_native_stack) {
     DumpNativeStack(os, tid, nullptr, "  native: ");
   }
-  os << "\n";
+  os << std::endl;
 }
 
 void ThreadList::DumpUnattachedThreads(std::ostream& os, bool dump_native_stack) {
@@ -216,11 +216,10 @@ class DumpCheckpoint FINAL : public Closure {
       ScopedObjectAccess soa(self);
       thread->Dump(local_os, dump_native_stack_, backtrace_map_.get());
     }
-    local_os << "\n";
     {
       // Use the logging lock to ensure serialization when writing to the common ostream.
       MutexLock mu(self, *Locks::logging_lock_);
-      *os_ << local_os.str();
+      *os_ << local_os.str() << std::endl;
     }
     barrier_.Pass(self);
   }