RFR: 8285487: AArch64: Do not generate unneeded trampolines for runtime calls [v5]

[Evgeny Astigeevich]

> [JDK-8280872](https://bugs.openjdk.java.net/browse/JDK-8280872) put the non-nmethod segment between two others. It made trampolines for runtime calls redundant in most cases.
> 
> This PR uses `target_needs_far_branch()` for runtime calls to check whether they need trampolines. Trampolines are not generated if they are not needed.
> 
> Testing:
> - `tier1`...`tier4`: Passed
> - `compiler/c2/aarch64/TestTrampoline.java`: Passed
> 
> Note: `compiler/c2/aarch64/TestTrampoline.java` requires the release build. This is because debug builds have the branch range set to 2M which causes always generation of trampolines.

Evgeny Astigeevich has updated the pull request incrementally with one additional commit since the last revision:

  Combine @requires; Change is_always_reachable to is_always_within_branch_range

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/8403/files
  - new: https://git.openjdk.org/jdk/pull/8403/files/6ddc3f0a..4db9dfc9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=8403&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=8403&range=03-04

  Stats: 9 lines in 2 files changed: 1 ins; 2 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/8403.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/8403/head:pull/8403

PR: https://git.openjdk.org/jdk/pull/8403