[llvm] [SPIRV] Handle vector load/store for RWBuffer (PR #125581)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `flang-aarch64-out-of-tree` running on `linaro-flang-aarch64-out-of-tree` while building `llvm` at step 8 "test-build-flang-unified-tree-check-flang".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/53/builds/11990

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

```
Step 8 (test-build-flang-unified-tree-check-flang) failure: test (failure)
******************** TEST 'Flang :: Evaluate/folding18.f90' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
Not assuming libpgmath support
Folding test failed:
test_ieee_support_standard .false._4

FAIL

--
Command Output (stderr):
--
RUN: at line 1: "/usr/bin/python3.10" /home/tcwg-buildbot/worker/flang-aarch64-out-of-tree/llvm-project/flang/test/Evaluate/test_folding.py /home/tcwg-buildbot/worker/flang-aarch64-out-of-tree/llvm-project/flang/test/Evaluate/folding18.f90 /home/tcwg-buildbot/worker/flang-aarch64-out-of-tree/build_flang/bin/flang -fc1
+ /usr/bin/python3.10 /home/tcwg-buildbot/worker/flang-aarch64-out-of-tree/llvm-project/flang/test/Evaluate/test_folding.py /home/tcwg-buildbot/worker/flang-aarch64-out-of-tree/llvm-project/flang/test/Evaluate/folding18.f90 /home/tcwg-buildbot/worker/flang-aarch64-out-of-tree/build_flang/bin/flang -fc1

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/125581