RFR: 8289230: Move PlatformXXX class declarations out of os_xxx.hpp [v2]

[Ioi Lam]

On Tue, 28 Jun 2022 21:02:53 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> I fixed it as you suggested. I also fixed semaphore.hpp where I copied the old pattern from.
>
> Doesn't the OS_HEADER() -similar macro that handles the posix case too? I don't see it though.

` OS_HEADER(threadCrashProtection)` will give threadCrashProtection_linux.hpp, etc. It won't give us threadCrashProtection_posix.hpp. I didn't want to write three threadCrashProtection_{aix,bsd,linux}.hpp files that each just has a single line that includes the _posix version.

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PR: https://git.openjdk.org/jdk/pull/9303