[llvm] [RISCV][GISel] Lower G_ABDS and G_ABDU (PR #155888)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `cross-project-tests-sie-ubuntu` running on `doug-worker-1a` while building `llvm` at step 6 "test-build-unified-tree-check-cross-project".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/181/builds/27339

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

```
Step 6 (test-build-unified-tree-check-cross-project) failure: test (failure)
******************** TEST 'cross-project-tests :: debuginfo-tests/dexter-tests/namespace.cpp' FAILED ********************
Exit Code: 2

Command Output (stdout):
--
namespace.cpp: nan/nan (nan) [Command '['/usr/bin/python3.8', '/home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/llvm-project/cross-project-tests/debuginfo-tests/dexter/dex/../dexter.py', 'run-debugger-internal-', '/tmp/lit-tmp-kreso9hy/dexter/tmp2wu4wz0r/tmp5hyc6qe8', '--working-directory=/tmp/lit-tmp-kreso9hy/dexter/tmp2wu4wz0r', '--unittest=off', '--indent-timer-level=3']' returned non-zero exit status 1.]
Command '['/usr/bin/python3.8', '/home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/llvm-project/cross-project-tests/debuginfo-tests/dexter/dex/../dexter.py', 'run-debugger-internal-', '/tmp/lit-tmp-kreso9hy/dexter/tmp2wu4wz0r/tmp5hyc6qe8', '--working-directory=/tmp/lit-tmp-kreso9hy/dexter/tmp2wu4wz0r', '--unittest=off', '--indent-timer-level=3']' returned non-zero exit status 1.
--
Command Output (stderr):
--
/home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/build/bin/clang++ -g -O0 /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/llvm-project/cross-project-tests/debuginfo-tests/dexter-tests/namespace.cpp -o /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/build/projects/cross-project-tests/debuginfo-tests/dexter-tests/Output/namespace.cpp.tmp # RUN: at line 8
+ /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/build/bin/clang++ -g -O0 /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/llvm-project/cross-project-tests/debuginfo-tests/dexter-tests/namespace.cpp -o /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/build/projects/cross-project-tests/debuginfo-tests/dexter-tests/Output/namespace.cpp.tmp
"/usr/bin/python3.8" "/home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/llvm-project/cross-project-tests/debuginfo-tests/dexter/dexter.py" test --fail-lt 1.0 -w      --binary /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/build/projects/cross-project-tests/debuginfo-tests/dexter-tests/Output/namespace.cpp.tmp --lldb-executable "/home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/build/bin/lldb-dap" --debugger lldb-dap -v -- /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/llvm-project/cross-project-tests/debuginfo-tests/dexter-tests/namespace.cpp # RUN: at line 9
+ /usr/bin/python3.8 /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/llvm-project/cross-project-tests/debuginfo-tests/dexter/dexter.py test --fail-lt 1.0 -w --binary /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/build/projects/cross-project-tests/debuginfo-tests/dexter-tests/Output/namespace.cpp.tmp --lldb-executable /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/build/bin/lldb-dap --debugger lldb-dap -v -- /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/llvm-project/cross-project-tests/debuginfo-tests/dexter-tests/namespace.cpp
note: Opening DAP server: /home/buildbot/buildbot-root/cross-project-tests-sie-ubuntu/build/bin/lldb-dap
warning: DAP: Unknown support flag: $__lldb_version
warning: DAP: Unknown support flag: completionTriggerCharacters
warning: DAP: Unknown support flag: exceptionBreakpointFilters
warning: DAP: Unknown support flag: supportTerminateDebuggee
warning: DAP: Unknown support flag: supportsBreakpointLocationsRequest
warning: DAP: Unknown support flag: supportsCompletionsRequest
warning: DAP: Unknown support flag: supportsDelayedStackTraceLoading
warning: DAP: Unknown support flag: supportsExceptionFilterOptions
warning: DAP: Unknown support flag: supportsExceptionInfoRequest
warning: DAP: Unknown support flag: supportsModuleSymbolsRequest
warning: DAP: Unknown support flag: capabilities
note: Successfully disconnected from DAP server.
warning: Attempted to write message after program closed: "<- {
  "body": {
    "exitCode": 9
  },
  "event": "exited",
  "seq": 0,
  "type": "event"
}"


****************************************


```

</details>

https://github.com/llvm/llvm-project/pull/155888