[llvm] [aarch64] Fix Arm64EC libcall lowering after recent refactoring. (PR #143977)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-arm-ubuntu` running on `linaro-lldb-arm-ubuntu` while building `llvm` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/18/builds/17539

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

```
Step 6 (test) failure: build (failure)
...
UNSUPPORTED: lldb-api :: tools/lldb-dap/restart/TestDAP_restart_runInTerminal.py (1203 of 3264)
UNSUPPORTED: lldb-api :: tools/lldb-dap/runInTerminal/TestDAP_runInTerminal.py (1204 of 3264)
UNSUPPORTED: lldb-api :: tools/lldb-dap/save-core/TestDAP_save_core.py (1205 of 3264)
PASS: lldb-api :: tools/lldb-dap/module/TestDAP_module.py (1206 of 3264)
PASS: lldb-api :: tools/lldb-dap/send-event/TestDAP_sendEvent.py (1207 of 3264)
PASS: lldb-api :: tools/lldb-dap/progress/TestDAP_Progress.py (1208 of 3264)
PASS: lldb-api :: tools/lldb-dap/restart/TestDAP_restart.py (1209 of 3264)
UNSUPPORTED: lldb-api :: tools/lldb-dap/stackTrace-x86/TestDAP_source_x86.py (1210 of 3264)
PASS: lldb-api :: tools/lldb-dap/source/TestDAP_source.py (1211 of 3264)
UNSUPPORTED: lldb-api :: tools/lldb-dap/stackTrace/subtleFrames/TestDAP_subtleFrames.py (1212 of 3264)
FAIL: lldb-api :: tools/lldb-dap/server/TestDAP_server.py (1213 of 3264)
******************** TEST 'lldb-api :: tools/lldb-dap/server/TestDAP_server.py' FAILED ********************
Script:
--
/usr/bin/python3.10 /home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/lldb/test/API/dotest.py -u CXXFLAGS -u CFLAGS --env LLVM_LIBS_DIR=/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./lib --env LLVM_INCLUDE_DIR=/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/include --env LLVM_TOOLS_DIR=/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin --arch armv8l --build-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex --lldb-module-cache-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex/module-cache-lldb/lldb-api --clang-module-cache-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex/module-cache-clang/lldb-api --executable /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin/lldb --compiler /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin/clang --dsymutil /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin/dsymutil --make /usr/bin/gmake --llvm-tools-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin --lldb-obj-root /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/tools/lldb --lldb-libs-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./lib --cmake-build-type Release /home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/lldb/test/API/tools/lldb-dap/server -p TestDAP_server.py
--
Exit Code: 1

Command Output (stdout):
--
lldb version 21.0.0git (https://github.com/llvm/llvm-project.git revision 222ab28a9240e03479341cba2f487b8350635fce)
  clang revision 222ab28a9240e03479341cba2f487b8350635fce
  llvm revision 222ab28a9240e03479341cba2f487b8350635fce
Skipping the following test categories: ['libc++', 'dsym', 'gmodules', 'debugserver', 'objc']

--
Command Output (stderr):
--
========= DEBUG ADAPTER PROTOCOL LOGS =========
no log file available
========= END =========
FAIL: LLDB (/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/bin/clang-arm) :: test_server_interrupt (TestDAP_server.TestDAP_server)
========= DEBUG ADAPTER PROTOCOL LOGS =========
no log file available
========= END =========
========= DEBUG ADAPTER PROTOCOL LOGS =========
no log file available
========= END =========
PASS: LLDB (/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/bin/clang-arm) :: test_server_port (TestDAP_server.TestDAP_server)
DAP session (client_1) error: Bad file descriptor
========= DEBUG ADAPTER PROTOCOL LOGS =========
no log file available
========= END =========
========= DEBUG ADAPTER PROTOCOL LOGS =========
no log file available
========= END =========
PASS: LLDB (/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/bin/clang-arm) :: test_server_unix_socket (TestDAP_server.TestDAP_server)
======================================================================
FAIL: test_server_interrupt (TestDAP_server.TestDAP_server)

```

</details>

https://github.com/llvm/llvm-project/pull/143977