RFR: 8278079: C2: expand_dtrace_alloc_probe doesn't take effect in macro.cpp

[Denghui Dong]

On Thu, 2 Dec 2021 13:40:05 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> Thanks for the explanation but then the only real use of `dtrace_extended_probes()` is gone and the `ExtendedDTraceProbes` flag has no effect, right?

dtrace_extended_probes() is still used in ciEnv::register_method, it's seems used to confirm ExtendedDTraceProbes/DTraceMethodProbes//DTraceAllocProbes(declared as product flags, should not be changed during running I think) is not changed during the compilation.

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PR: https://git.openjdk.java.net/jdk/pull/6639