RFR: 8289780: Avoid formatting stub names when Forte is not enabled [v2]

[Coleen Phillimore]

On Wed, 6 Jul 2022 17:50:54 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> `Forte::register_stub()` should be called only when the JVm is being instrumented by Forte (aka "Oracle Developer Studio")
>> 
>> https://www.oracle.com/tools/developerstudio/downloads/developer-studio-jsp.html
>> 
>> We currently always format the name of generated stubs and call `Forte::register_stub()`, which usually does nothing.
>> 
>> Example:
>> 
>> https://github.com/openjdk/jdk/blob/master/src/hotspot/share/runtime/sharedRuntime.cpp#L2686-L2697
>> 
>> To improve start-up, we should check if Forte is enabled before formatting the name.
>> 
>> I also renamed some `#ifndef IA64` around the code that I touched.
>
> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Do not remove Forte::register_stub as it is used on Linux as well

src/hotspot/share/prims/forte.hpp line 32:

> 30: class Forte : AllStatic {
> 31:  public:
> 32:    static bool is_enabled() NOT_JVMTI_RETURN_(false);

I don't think the rest of this forte code is disabled by JVMTI.

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