RFR: 8366984: Remove delay slot support [v2]

[Daniel Jeliński]

> SPARC was the only supported architecture that uses a delay slot. The SPARC port was removed in JDK 15, and the code is effectively dead. Let's remove it.
> 
> The changes are no-op on all architectures that do not use delay slots. I still tested tier 1-5 on mach5, no related failures.

Daniel Jeliński has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27119/files
  - new: https://git.openjdk.org/jdk/pull/27119/files/330d5ad1..330d5ad1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27119&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27119&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27119.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27119/head:pull/27119

PR: https://git.openjdk.org/jdk/pull/27119