8384161: [PPC64] Consolidate code related to calls in nmethods that use trampoline stubs

[reinrich]

This is a backport of a ppc64 code cleanup (original commit openjdk/jdk@94d3aec).
It consolidates code to generate calls in nmethods that require a trampoline stub to reach far targets into MacroAssembler::trampoline_call().

I want to do this to support maintenance of related parts in general.

Risk is moderate. The change reorganizes existing code, test coverage of calls in nmethods is very good and changes are limited to ppc64.

I had to resolve to simple conflicts.

• c1_LIRAssembler_ppc.hpp: copyright year mismatch
• ppc.ad: enc_class postalloc_expand_java_dynamic_call_sched: the removed line call->_method_handle_invoke = _method_handle_invoke; was not present in the original commit.

The fix passed our CI testing:
Tier 1-4 of hotspot and jdk. All of langtools and jaxp. Renaissance Suite and SAP specific tests.
Testing was done on the main platforms and also on Linux/PPC64le and AIX.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• JDK-8384161 needs maintainer approval
• Commit message must refer to an issue

Issue

• JDK-8384161: [PPC64] Consolidate code related to calls in nmethods that use trampoline stubs (Enhancement - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk25u-dev.git pull/627/head:pull/627
$ git checkout pull/627

Update a local copy of the PR:
$ git checkout pull/627
$ git pull https://git.openjdk.org/jdk25u-dev.git pull/627/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 627

View PR using the GUI difftool:
$ git pr show -t 627

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk25u-dev/pull/627.diff

[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.