[llvm] [RISCV][GISel] Lower G_SSHLSAT and G_USHLSAT (PR #155642)

[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/21209

<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
...
10.453 [1/15/43] Linking CXX executable unittests/IR/IRTests
10.711 [1/14/44] Linking CXX executable unittests/ExecutionEngine/MCJIT/MCJITTests
10.767 [1/13/45] Linking CXX executable unittests/MIR/MIRTests
11.075 [1/12/46] Linking CXX executable unittests/tools/llvm-cfi-verify/CFIVerifyTests
11.426 [1/11/47] Linking CXX executable unittests/Target/TargetMachineCTests
11.862 [1/10/48] Linking CXX executable unittests/Passes/PassBuilderBindings/PassesBindingsTests
12.502 [1/9/49] Linking CXX executable unittests/Transforms/Utils/UtilsTests
12.705 [1/8/50] Linking CXX executable unittests/Target/X86/X86Tests
12.803 [1/7/51] Linking CXX executable unittests/Transforms/Scalar/ScalarTests
12.876 [1/6/52] Linking CXX executable unittests/Passes/Plugins/PluginsTests
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=1213.692051

```

</details>

https://github.com/llvm/llvm-project/pull/155642