RFR: 8253742: POSIX signal code cleanup [v3]

[David Holmes]

On Tue, 3 Nov 2020 21:45:04 GMT, Gerard Ziemski <gziemski at openjdk.org> wrote:

>> print_signal_handlers() is declared in os.h, so at first glance I thought I couldn't collapse it further. I'll have a second look.
>
> void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) is declared in os.h and is used on Windows platform as well.

So we have one definition in os_posix.cpp and one in os_windows.cpp.

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PR: https://git.openjdk.java.net/jdk/pull/636