8295146: Newer C/C++ language features can be used in native code

[TheShermanTanker]

Refactor code across the JDK to rely less on compiler extensions after JDK-8292008 and JDK-8247283.

I'm not entirely sure whether the alignment specified in src/jdk.jdwp.agent/share/native/libjdwp/ArrayReferenceImpl.c and src/java.security.jgss/share/native/libj2gss/GSSLibStub.c only benefits code compiled for Windows, so I left the _WIN32 check there for now

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Progress

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Issue

• JDK-8295146: Newer C/C++ language features can be used in native code

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