RFR: 8256718: Obsolete the long term deprecated and aliased Trace flags

[Serguei Spitsyn]

On Mon, 30 Nov 2020 21:13:05 GMT, Harold Seigel <hseigel at openjdk.org> wrote:

> Please review this change to obsolete the deprecated and aliased Trace flags.  The now empty aliased_logging_flags support was left in arguments.cpp for use by trace flags that get deprecated and aliased in the future.
> 
> With this change, users will get the following example messages when using these obsolete flags, depending on whether -XX:+... or -XX:-... was specified:
> 
> VM warning: Ignoring option TraceClassPaths; support was removed in 16.0.  Please use -Xlog:class+path=info instead.
> 
> VM warning: Ignoring option TraceClassPaths; support was removed in 16.0.  Please use -Xlog:class+path=off instead.
> 
> The change was tested with tiers1and 2 on Linux, Windows, and MacOS, and tiers 3-5 on Linux x64 and with JCK lang and vm tests.
> 
> Thanks, Harold

Hi Harold,

The fix looks okay to me.
I was more focusing on the serviceability flags.
I'm not sure the flag `TraceJVMTIObjectTagging` should be mentioned in the `src/java.base/share/man/java.1` the same way as the `TraceRedefineClasses`.

Thanks,
Serguei

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Marked as reviewed by sspitsyn (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1525