RFR: 8281815: x86: Use short jumps in TIG::generate_slow_signature_handler

[Richard Reingruber]

On Tue, 15 Feb 2022 09:40:28 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Similar to [JDK-8281744](https://bugs.openjdk.java.net/browse/JDK-8281744), this change improves `TemplateInterpreterGenerator::generate_slow_signature_handler`: there are only a few moves between the jumps, and we can tell `MacroAssembler` those can be short. This code is used to process arguments after the slow call to VM, so the performance improvement is drowned by the call itself. This makes interpreter code a bit more compact, though.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `hotspot:tier1`
>  - [x] Linux x86_32 fastdebug `hotspot:tier1`

On s390, being CISC too, there are similar issues. We addressed them with `NearLabel`, `branch_optimized`, and `compare_and_branch_optimized`. They provide a higher level of abstraction which helps writing better code without knowing all the details, which at least I instantly forget after looking into the manual.

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PR: https://git.openjdk.java.net/jdk/pull/7475