[llvm] [SPIR-V] Preserve pointer-to-pointer element type for T*& parameters (PR #203113)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ppc64le-mlir-rhel-clang` running on `ppc64le-mlir-rhel-test` while building `llvm` at step 2 "checkout".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/129/builds/45997

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

```
Step 2 (checkout) failure: update (failure) (timed out)
...
Resolving deltas:  99% (21533/21723)
Resolving deltas:  99% (21565/21723)
Resolving deltas:  99% (21598/21723)
Resolving deltas:  99% (21636/21723)
Resolving deltas:  99% (21645/21723)
Resolving deltas:  99% (21695/21723)
Resolving deltas: 100% (21723/21723)
Resolving deltas: 100% (21723/21723), completed with 6821 local objects.
>From https://github.com/llvm/llvm-project
 * branch                      main       -> FETCH_HEAD
command timed out: 1200 seconds without output running [b'git', b'checkout', b'-f', b'9a3e91daa7798e8695a68b01a8ff9b76e54f8524'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1204.066576
git cat-file -e 9a3e91daa7798e8695a68b01a8ff9b76e54f8524
 in dir /home/buildbots/llvm-external-buildbots/workers/ppc64le-mlir-rhel-test/ppc64le-mlir-rhel-clang-build/llvm-project (timeout 1200 secs)
 watching logfiles {}
 argv: [b'git', b'cat-file', b'-e', b'9a3e91daa7798e8695a68b01a8ff9b76e54f8524']
 environment:
  BASH_FUNC__module_raw%%=() {  unset _mlshdbg;
 if [ "${MODULES_SILENT_SHELL_DEBUG:-0}" = '1' ]; then
 case "$-" in 
 *v*x*)
 set +vx;
 _mlshdbg='vx'
 ;;
 *v*)
 set +v;
 _mlshdbg='v'
 ;;
 *x*)
 set +x;
 _mlshdbg='x'
 ;;
 *)
 _mlshdbg=''
 ;;
 esac;
 fi;
 unset _mlre _mlIFS;
 if [ -n "${IFS+x}" ]; then
 _mlIFS=$IFS;
 fi;
 IFS=' ';
 for _mlv in ${MODULES_RUN_QUARANTINE:-};
 do
 if [ "${_mlv}" = "${_mlv##*[!A-Za-z0-9_]}" -a "${_mlv}" = "${_mlv#[0-9]}" ]; then
 if [ -n "`eval 'echo ${'$_mlv'+x}'`" ]; then
 _mlre="${_mlre:-}${_mlv}_modquar='`eval 'echo ${'$_mlv'}'`' ";

```

</details>

https://github.com/llvm/llvm-project/pull/203113