hg: jdk-updates/jdk11u-dev: 8260030: Improve stringStream buffer handling

[thomas.stuefe at gmail.com]

Changeset: 3810766e2476
Author:    stuefe
Date:      2021-05-20 07:06 +0200
URL:       https://hg.openjdk.java.net/jdk-updates/jdk11u-dev/rev/3810766e2476

8260030: Improve stringStream buffer handling
Reviewed-by: iklam, kbarrett

! src/hotspot/share/utilities/ostream.cpp
! src/hotspot/share/utilities/ostream.hpp
! test/hotspot/gtest/utilities/test_ostream.cpp