RFR: 8288082: Build failure due to __clang_major__ is not defined after JDK-8214976

[Kim Barrett]

On Wed, 8 Jun 2022 23:36:59 GMT, Jie Fu <jiefu at openjdk.org> wrote:

> Hi all,
> 
> Build failure was observed when build on a machine without clang.
> Please review this trivial patch which fixes the build failure due to `__clang_major__` is not defined.
> 
> Thanks.
> Best regards,
> Jie

Sorry about this.  I didn't realize we were building with `Wundef`.  I didn't have any failures in my testing because I was using gcc9+, so the offending expression doesn't get processed.  I think this only fails with gcc versions before 9.

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PR: https://git.openjdk.java.net/jdk/pull/9096