[compiler-rt] [compiler-rt] Remove enable_execute_stack support on arm64 Darwin (PR #158386)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-ppc64le-linux-multistage` running on `ppc64le-clang-multistage-test` while building `compiler-rt` at step 11 "ninja check 2".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/76/builds/12879

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 11 (ninja check 2) failure: 1200 seconds without output running [b'ninja', b'check-all', b'check-runtimes'], attempting to kill
...
PASS: LLVM :: tools/llvm-readobj/ELF/AMDGPU/elf-headers.test (101767 of 101777)
PASS: LLVM :: tools/llvm-libtool-darwin/L-and-l.test (101768 of 101777)
PASS: LLVM :: tools/llvm-objcopy/ELF/cross-arch-headers.test (101769 of 101777)
PASS: LLVM :: CodeGen/RISCV/reserved-regs.ll (101770 of 101777)
PASS: mlgo-utils :: corpus/extract_ir_script.test (101771 of 101777)
PASS: lit :: shtest-shell.py (101772 of 101777)
PASS: LLVM :: tools/llvm-readobj/ELF/note-core.test (101773 of 101777)
PASS: LLVM :: tools/llvm-readobj/ELF/file-header-machine-types.test (101774 of 101777)
PASS: lit :: shtest-define.py (101775 of 101777)
PASS: LLVM :: tools/llvm-objdump/ELF/AMDGPU/subtarget.ll (101776 of 101777)
command timed out: 1200 seconds without output running [b'ninja', b'check-all', b'check-runtimes'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=3574.334290

```

</details>

https://github.com/llvm/llvm-project/pull/158386