RFR: 8280152: AArch64: Reuse runtime call trampolines [v7]

[Yi-Fan Tsai]

> 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.

Yi-Fan Tsai has updated the pull request incrementally with one additional commit since the last revision:

  Grow hashtable only if a new entry is added

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9405/files
  - new: https://git.openjdk.org/jdk/pull/9405/files/877ebb8b..40e51714

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9405&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9405&range=05-06

  Stats: 6 lines in 1 file changed: 3 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/9405.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9405/head:pull/9405

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