RFR: 8289780: Remove Forte::register_stub

[Ioi Lam]

On Wed, 6 Jul 2022 00:38:14 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> I removed `Remove Forte::register_stub` since it's used only by the Solaris Forte(TM) Performance Tools collector, which is no longer supported by the JDK.
> 
> I also fixed a couple of places where the stub name is computed unnecessarily.
> 
> Also renamed some `#ifndef IA64` around the code that I touched.

It turns out that `collector_func_load` is used by OracleDeveloperStudio on Linux as well, so I can't remove the call to collector_func_load. I think this (weak) function will be non-null when OracleDeveloperStudio loads the JVM:


$ nm OracleDeveloperStudio12.6-linux-x86-bin/developerstudio12.6/lib/analyzer/amd64/libcollector.so \
     | grep collector_func_load
000000000002efd0 T __collector_func_load
000000000002efd0 W collector_func_load


So slight change of plan. I am adding a check to avoid computing the `blob_id`, etc, when Forte::is_enabled()` is false, which will be the case in most cases.

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PR: https://git.openjdk.org/jdk/pull/9386