[llvm] [LoadStoreVectorizer] Fill gaps in load/store chains to enable vectorization (PR #159388)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-nvptx64-nvidia-ubuntu` running on `as-builder-7` while building `llvm` at step 6 "test-build-unified-tree-check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/160/builds/29454

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

```
Step 6 (test-build-unified-tree-check-llvm) failure: test (failure)
******************** TEST 'LLVM :: CodeGen/NVPTX/LoadStoreVectorizer.ll' FAILED ********************
Exit Code: 255

Command Output (stdout):
--
# RUN: at line 2
/home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/bin/llc < /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/llvm-project/llvm/test/CodeGen/NVPTX/LoadStoreVectorizer.ll | /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/bin/FileCheck -check-prefix=ENABLED /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/llvm-project/llvm/test/CodeGen/NVPTX/LoadStoreVectorizer.ll
# executed command: /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/bin/llc
# executed command: /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/bin/FileCheck -check-prefix=ENABLED /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/llvm-project/llvm/test/CodeGen/NVPTX/LoadStoreVectorizer.ll
# RUN: at line 3
/home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/bin/llc -disable-nvptx-load-store-vectorizer < /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/llvm-project/llvm/test/CodeGen/NVPTX/LoadStoreVectorizer.ll | /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/bin/FileCheck -check-prefix=DISABLED /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/llvm-project/llvm/test/CodeGen/NVPTX/LoadStoreVectorizer.ll
# executed command: /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/bin/llc -disable-nvptx-load-store-vectorizer
# executed command: /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/bin/FileCheck -check-prefix=DISABLED /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/llvm-project/llvm/test/CodeGen/NVPTX/LoadStoreVectorizer.ll
# RUN: at line 4
/home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/bin/llc < /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/llvm-project/llvm/test/CodeGen/NVPTX/LoadStoreVectorizer.ll | /usr/local/cuda/bin/ptxas -c -
# executed command: /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/bin/llc
# executed command: /usr/local/cuda/bin/ptxas -c -
# .---command stderr------------
# | ptxas /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/lit-tmp-cpzdu175/tmpxft_00072596_00000000-0_stdin, line 37; error   : Feature 'used_bytes_mask' requires PTX ISA .version 8.3 or later
# | ptxas /home/buildbot/worker/as-builder-7/llvm-nvptx64-nvidia-ubuntu/build/lit-tmp-cpzdu175/tmpxft_00072596_00000000-0_stdin, line 37; error   : Feature 'used_bytes_mask' requires .target sm_50 or higher
# | ptxas fatal   : Ptx assembly aborted due to errors
# `-----------------------------
# error: command failed with exit status: 255

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/159388