RFR: 8280152: AArch64: Reuse runtime call trampolines in C2

[Evgeny Astigeevich]

On Thu, 7 Jul 2022 04:10:57 GMT, Yi-Fan Tsai <duke at openjdk.org> wrote:

> A trampoline stub could be generated for each runtime call. These trampolines could be duplication if the callees are the same. This change delays the stub generation and generates one stub for a distinct callee.
> 
> Benchmark als, chi-square, dec-tree, gauss-mix, log-regression, movie-lens, naive-bayes, page-rank, fj-means, reactors, future-genetic, mnemonics, dotty, scala-kmeans, and finagle-http in Renaissance (0.14.1) are tested. The sum of the used size of CodeHeap 'non-profiled nmethods' and CodeHeap 'profiled nmethods' shows ~4.7% reduction on average.

Hi @yftsai,
Thank you for the PR.
>From the changes I see it covers both C1 and C2. Could you please update the JBS issues to reflect this?

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PR: https://git.openjdk.org/jdk/pull/9405