[clang] [llvm] [LLVM] Add GNU make jobserver support (PR #145131)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-aarch64-quick` running on `linaro-clang-aarch64-quick` while building `clang,llvm` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/65/builds/23513

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

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM-Unit :: Support/./SupportTests/166/415' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/unittests/Support/./SupportTests-LLVM-Unit-893862-166-415.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=415 GTEST_SHARD_INDEX=166 /home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/unittests/Support/./SupportTests
--


Note: This is test shard 167 of 415.
[==========] Running 4 tests from 4 test suites.
[----------] Global test environment set-up.
[----------] 1 test from CheckedArithmetic
[ RUN      ] CheckedArithmetic.CheckedMulUnsigned
[       OK ] CheckedArithmetic.CheckedMulUnsigned (0 ms)
[----------] 1 test from CheckedArithmetic (0 ms total)

[----------] 1 test from JobserverStrategyTest
[ RUN      ] JobserverStrategyTest.ParallelSortIsLimited
[       OK ] JobserverStrategyTest.ParallelSortIsLimited (88 ms)
[----------] 1 test from JobserverStrategyTest (88 ms total)

[----------] 1 test from ProgramEnvTest
[ RUN      ] ProgramEnvTest.TestExecuteWithNoStacktraceHandler
Note: Google Test filter = ProgramEnvTest.TestExecuteWithNoStacktraceHandler
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from ProgramEnvTest
[ RUN      ] ProgramEnvTest.TestExecuteWithNoStacktraceHandler
 #0 0x0000b0b4d2f4aba4 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/unittests/Support/SupportTests+0x64aba4)
 #1 0x0000b0b4d2cea2a8 (anonymous namespace)::ProgramEnvTest_TestExecuteWithNoStacktraceHandler_Test::TestBody() ProgramTest.cpp:0:0
 #2 0x0000b0b4d2f6fc08 testing::Test::Run() (/home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/unittests/Support/SupportTests+0x66fc08)
 #3 0x0000b0b4d2f70f2c testing::TestInfo::Run() (/home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/unittests/Support/SupportTests+0x670f2c)
 #4 0x0000b0b4d2f71b68 testing::TestSuite::Run() (/home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/unittests/Support/SupportTests+0x671b68)
 #5 0x0000b0b4d2f81ee8 testing::internal::UnitTestImpl::RunAllTests() (/home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/unittests/Support/SupportTests+0x681ee8)
 #6 0x0000b0b4d2f81834 testing::UnitTest::Run() (/home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/unittests/Support/SupportTests+0x681834)
 #7 0x0000b0b4d2f5c11c main (/home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/unittests/Support/SupportTests+0x65c11c)
 #8 0x0000ed6c3f0773fc __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
 #9 0x0000ed6c3f0774cc call_init ./csu/../csu/libc-start.c:128:20
#10 0x0000ed6c3f0774cc __libc_start_main ./csu/../csu/libc-start.c:379:5
#11 0x0000b0b4d2a16770 _start (/home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/unittests/Support/SupportTests+0x116770)
[       OK ] ProgramEnvTest.TestExecuteWithNoStacktraceHandler (468 ms)
[----------] 1 test from ProgramEnvTest (468 ms total)

[----------] 1 test from YAMLIO
[ RUN      ] YAMLIO.TestReadBuiltInTypesint8UnderError
[       OK ] YAMLIO.TestReadBuiltInTypesint8UnderError (0 ms)
[----------] 1 test from YAMLIO (0 ms total)

[----------] Global test environment tear-down
[==========] 4 tests from 4 test suites ran. (557 ms total)
[  PASSED  ] 4 tests.
...

```

</details>

https://github.com/llvm/llvm-project/pull/145131