RFR: 8263718: unused-result warning happens at os_linux.cpp

[Yasumasa Suenaga]

On Sat, 20 Mar 2021 02:29:16 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

> I debug'ed fastdebug JDK on Visual Studio, it seems to work `alloca()`:

I used cl.exe from Visual Studio 2019 (16.9.1). The generated code might be different by compiler version of course.

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PR: https://git.openjdk.java.net/jdk/pull/3042