[llvm] [lit] Implement builtin umask (PR #94621)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-aarch64-global-isel` running on `linaro-clang-aarch64-global-isel` while building `llvm` at step 7 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/125/builds/571

Here is the relevant piece of the build log for the reference:
```
Step 7 (ninja check 1) failure: stage 1 checked (failure)
...
PASS: Clang :: CodeGen/aarch64-sve-intrinsics/acle_sve_rintn.c (321 of 74686)
PASS: Clang :: CodeGen/aarch64-sve-intrinsics/acle_sve_cmpeq.c (322 of 74686)
PASS: LLVM :: CodeGen/AMDGPU/memory-legalizer-local-system.ll (323 of 74686)
PASS: Clang :: OpenMP/target_simd_codegen.cpp (324 of 74686)
PASS: Clang :: CodeGen/PowerPC/ppc-emmintrin.c (325 of 74686)
PASS: LLVM :: CodeGen/RISCV/reserved-regs.ll (326 of 74686)
PASS: LLVM :: CodeGen/AArch64/Atomics/aarch64_be-atomicrmw-outline_atomics.ll (327 of 74686)
PASS: Clang :: CodeGen/aarch64-sve-intrinsics/acle_sve_nor.c (328 of 74686)
PASS: Clang :: CodeGen/aarch64-sve-intrinsics/acle_sve_prfh.c (329 of 74686)
UNRESOLVED: Clang :: utils/update_cc_test_checks/generated-funcs.test (330 of 74686)
******************** TEST 'Clang :: utils/update_cc_test_checks/generated-funcs.test' FAILED ********************
Exception during script execution:
Traceback (most recent call last):
  File "/home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/llvm/utils/lit/lit/worker.py", line 76, in _execute_test_handle_errors
    result = test.config.test_format.execute(test, lit_config)
  File "/home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/llvm/utils/lit/lit/formats/shtest.py", line 29, in execute
    return lit.TestRunner.executeShTest(
  File "/home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/llvm/utils/lit/lit/TestRunner.py", line 2295, in executeShTest
    return _runShTest(test, litConfig, useExternalSh, script, tmpBase)
  File "/home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/llvm/utils/lit/lit/TestRunner.py", line 2239, in _runShTest
    res = runOnce(execdir)
  File "/home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/llvm/utils/lit/lit/TestRunner.py", line 2215, in runOnce
    res = executeScriptInternal(
  File "/home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/llvm/utils/lit/lit/TestRunner.py", line 1091, in executeScriptInternal
    exitCode, timeoutInfo = executeShCmd(
  File "/home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/llvm/utils/lit/lit/TestRunner.py", line 205, in executeShCmd
    finalExitCode = _executeShCmd(cmd, shenv, results, timeoutHelper)
  File "/home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/llvm/utils/lit/lit/TestRunner.py", line 707, in _executeShCmd
    res = _executeShCmd(cmd.lhs, shenv, results, timeoutHelper)
  File "/home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/llvm/utils/lit/lit/TestRunner.py", line 707, in _executeShCmd
    res = _executeShCmd(cmd.lhs, shenv, results, timeoutHelper)
  File "/home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/llvm/utils/lit/lit/TestRunner.py", line 707, in _executeShCmd
    res = _executeShCmd(cmd.lhs, shenv, results, timeoutHelper)
  [Previous line repeated 13 more times]
  File "/home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/llvm/utils/lit/lit/TestRunner.py", line 712, in _executeShCmd
    res = _executeShCmd(cmd.rhs, shenv, results, timeoutHelper)
  File "/home/tcwg-buildbot/worker/clang-aarch64-global-isel/llvm/llvm/utils/lit/lit/TestRunner.py", line 892, in _executeShCmd
    subprocess.Popen(
TypeError: __init__() got an unexpected keyword argument 'umask'


********************
PASS: Clang :: CodeGen/aarch64-sve-intrinsics/acle_sve_aclt.c (331 of 74686)
PASS: Clang :: CodeGen/aarch64-sve-intrinsics/acle_sve_recps.c (332 of 74686)
PASS: Clang :: CodeGen/aarch64-sve-intrinsics/acle_sve_asr.c (333 of 74686)
PASS: Clang :: OpenMP/target_teams_distribute_parallel_for_simd_schedule_codegen.cpp (334 of 74686)
PASS: Clang :: CodeGen/aarch64-sme2-intrinsics/acle_sme2_unpkx4.c (335 of 74686)
PASS: Clang :: CodeGen/aarch64-sve-intrinsics/acle_sve_trn1.c (336 of 74686)
PASS: Clang :: Analysis/use-after-move.cpp (337 of 74686)

```

https://github.com/llvm/llvm-project/pull/94621