[llvm] [SelectionDAG] Move sign pattern check from AArch64 and ARM to general SelectionDAG (PR #151736)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `arc-builder` running on `arc-worker` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/3/builds/19945

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

```
Step 6 (test-build-unified-tree-check-all) failure: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
...
11.353 [1/12/46] Linking CXX executable unittests/IR/IRTests
12.061 [1/11/47] Linking CXX executable unittests/Target/TargetMachineCTests
12.625 [1/10/48] Linking CXX executable unittests/Transforms/Instrumentation/InstrumentationTests
12.677 [1/9/49] Linking CXX executable unittests/Passes/PassBuilderBindings/PassesBindingsTests
12.818 [1/8/50] Linking CXX executable unittests/Transforms/Coroutines/CoroTests
13.139 [1/7/51] Linking CXX executable unittests/tools/llvm-mca/LLVMMCATests
13.228 [1/6/52] Linking CXX executable unittests/tools/llvm-exegesis/LLVMExegesisTests
13.336 [1/5/53] Linking CXX executable unittests/Target/X86/X86Tests
13.699 [1/4/54] Linking CXX executable unittests/Passes/Plugins/PluginsTests
17.032 [1/3/55] Linking CXX executable tools/clang/unittests/Interpreter/ExceptionTests/ClangReplInterpreterExceptionTests
command timed out: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1218.083118

```

</details>

https://github.com/llvm/llvm-project/pull/151736