RFR: 8330520: linux ppc64le clang build fails in os_linux.cpp with static_assert with no message is a C++17 extension

[Matthias Baesken]

We run into the following build error when compiling on Linux ppc64le with the clang toolchain


jdk/src/hotspot/os/linux/os_linux.cpp:2975:65: error: 'static_assert' with no message is a C++17 extension [-Werror,-Wc++17-extensions]
static_assert(MADV_POPULATE_WRITE == MADV_POPULATE_WRITE_value);


Currently it is not clear when "8314488: Compile the JDK as C++17" will be in the codebase so better fix the static_assert .

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Commit messages:
 - JDK-8330520

Changes: https://git.openjdk.org/jdk/pull/18816/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18816&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330520
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18816.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18816/head:pull/18816

PR: https://git.openjdk.org/jdk/pull/18816