[llvm] [RISCV] Intrinsic Support for XCVelw (PR #129168)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-s390x-linux-lnt` running on `systemz-1` while building `llvm` at step 7 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/136/builds/6119

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

```
Step 7 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'Clang :: CodeGen/SystemZ/builtins-systemz-zvector.c' FAILED ********************
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 2
/home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/clang -cc1 -internal-isystem /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/lib/clang/22/include -nostdsysteminc -target-cpu z13 -triple s390x-linux-gnu  -O2 -fzvector -flax-vector-conversions=none  -Wall -Wno-unused -Werror -emit-llvm /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/clang/test/CodeGen/SystemZ/builtins-systemz-zvector.c -o - | /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/FileCheck /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/clang/test/CodeGen/SystemZ/builtins-systemz-zvector.c
# executed command: /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/clang -cc1 -internal-isystem /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/lib/clang/22/include -nostdsysteminc -target-cpu z13 -triple s390x-linux-gnu -O2 -fzvector -flax-vector-conversions=none -Wall -Wno-unused -Werror -emit-llvm /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/clang/test/CodeGen/SystemZ/builtins-systemz-zvector.c -o -
# executed command: /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/FileCheck /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/clang/test/CodeGen/SystemZ/builtins-systemz-zvector.c
# RUN: at line 5
/home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/clang -cc1 -internal-isystem /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/lib/clang/22/include -nostdsysteminc -target-cpu z13 -triple s390x-linux-gnu  -O2 -fzvector -flax-vector-conversions=none  -Wall -Wno-unused -Werror -S /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/clang/test/CodeGen/SystemZ/builtins-systemz-zvector.c -o - | /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/FileCheck /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/clang/test/CodeGen/SystemZ/builtins-systemz-zvector.c --check-prefix=CHECK-ASM
# executed command: /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/clang -cc1 -internal-isystem /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/lib/clang/22/include -nostdsysteminc -target-cpu z13 -triple s390x-linux-gnu -O2 -fzvector -flax-vector-conversions=none -Wall -Wno-unused -Werror -S /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/clang/test/CodeGen/SystemZ/builtins-systemz-zvector.c -o -
# .---command stderr------------
# | fatal error: error in backend: Cannot select: intrinsic %llvm.s390.vpklsg
# `-----------------------------
# error: command failed with exit status: 70
# executed command: /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/FileCheck /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/clang/test/CodeGen/SystemZ/builtins-systemz-zvector.c --check-prefix=CHECK-ASM
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/stage1/bin/FileCheck /home/uweigand/sandbox/buildbot/clang-s390x-linux-lnt/llvm/clang/test/CodeGen/SystemZ/builtins-systemz-zvector.c --check-prefix=CHECK-ASM
# `-----------------------------
# error: command failed with exit status: 2

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/129168