Revert "Add JLJITLinkMemoryManager (ports memory manager to JITLink)"

[giordano]

Reverts #60105. Nightly builds of aarch64-darwin Julia hang at startup on some systems, notably on GitHub Actions, making all nightly jobs timeout (after 6 hours...), see https://discourse.julialang.org/t/ci-testing-hangs-on-macos-nightly/133909 (previously reported on Slack at https://julialang.slack.com/archives/CPWJ5DGG1/p1763055610279379). See also julia-actions/julia-runtest#155. The error message when the process receives a SIGTERM signal is

in expression starting at none:0
__psynch_cvwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0) at (unknown file)
__psynch_mutexwait at /usr/lib/system/libsystem_kernel.dylib (unknown line)
unknown function (ip: 0x0) at (unknown file)
Allocations: 1 (Pool: 1; Big: 0); GC: 0

I can reliably reproduce it locally on a M1 box with MacOSX 12.6 21.6.0, I can provide more information as needed.

I bisected the issue to #60105. CC @xal-0 for your information.

[giordano]

On the machine where I can reproduce the hang using builds from buildkite, I also systematically can't compile latest master (9af9b15) because I get the error

    JULIA usr/lib/julia/basecompiler-o.a
ERROR: rethrow() not allowed outside a catch block
make[1]: *** [/Volumes/STORAGE/mose/repo/julia/usr/lib/julia/basecompiler-o.a] Error 1
make: *** [julia-sysimg-release] Error 2

which @xal-0 mentioned on Slack is happening also on CI here quite frequently when building Julia. This revert PR also resolves that issue for me. Looks like #60105 had quite a few issues on aarch64-darwin

[giordano]

And just to further confirm this PR resolves the hang:

$ curl -LsfO https://buildkite.com/organizations/julialang/pipelines/julia-master/builds/52235/jobs/019aa86e-9eba-44e6-8a8f-09e9120a3250/artifacts/019aa87a-47dc-4ebc-b32a-d8a74145df20
$ tar xzf 019aa87a-47dc-4ebc-b32a-d8a74145df20 
$ julia-305ae33084/bin/julia 
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.14.0-DEV.1278 (2025-11-21)
 _/ |\__'_|_|_|\__'_|  |  revert-60105-jitlink-cgmemmgr/305ae33084f (fork: 1 commits, 0 days)
|__/                   |

julia> 

Also, my local build, now successful:

$ ./julia 
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.14.0-DEV.1278 (2025-11-21)
 _/ |\__'_|_|_|\__'_|  |  revert-60105-jitlink-cgmemmgr/305ae33084 (fork: 1 commits, 0 days)
|__/                   |

julia> 

[giordano]

For the record, prompted by a request from @xal-0 I found that System Integrity Protection is disabled on both systems where I could reproduce the hang (GitHub Actions and another remote M1 box I have access to):

$ csrutil status
System Integrity Protection status: disabled.

while it's enabled on other aarch64-darwin machines where I can't reproduced the issue (this is also the default, so most users will probably not be affected):

% csrutil status 
System Integrity Protection status: enabled.

The correlation between SIP being disabled and the issues is quite strong for the moment.