git: openjdk/jdk: 8288082: Build failure due to __clang_major__ is not defined after JDK-8214976

[Jie Fu]

Changeset: a941bc2d
Author:    Jie Fu <jiefu at openjdk.org>
Date:      2022-06-09 00:01:31 +0000
URL:       https://git.openjdk.java.net/jdk/commit/a941bc2de674fdd77cdbbdf3641309fc39bfc0c4

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

Reviewed-by: dholmes

! src/hotspot/share/utilities/compilerWarnings_gcc.hpp