RFR: 8262952: [macos_aarch64] os::commit_memory failure [v3]

[Gerard Ziemski]

> On x86_64 macOS the following sequence works just fine:
> 
> attempt_reserve_memory_at(executable=false)
> commit_memory(executable=true)
> 
> however, on aarch64 macOS it fails.
> 
> We fix the test itself to explicitly ask for executable memory when reserving it since it later commits it as executable.

Gerard Ziemski has updated the pull request incrementally with one additional commit since the last revision:

  use the existing executable flag to indicate whether we want to commit exec memory or not

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3865/files
  - new: https://git.openjdk.java.net/jdk/pull/3865/files/ad3467b4..63d33efc

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3865&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3865&range=01-02

  Stats: 4 lines in 1 file changed: 2 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3865.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3865/head:pull/3865

PR: https://git.openjdk.java.net/jdk/pull/3865