[clang] [HLSL] Implement output parameter (PR #101083)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-aarch64-sve-vls` running on `linaro-g3-02` while building `clang` at step 7 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/143/builds/1833

<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 'Clangd :: crash-parse.test' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
Content-Length: 3402

{
  "id": 0,
  "jsonrpc": "2.0",
  "result": {
    "capabilities": {
      "astProvider": true,
      "callHierarchyProvider": true,
      "clangdInlayHintsProvider": true,
      "codeActionProvider": true,
      "compilationDatabase": {
        "automaticReload": true
      },
      "completionProvider": {
        "resolveProvider": false,
        "triggerCharacters": [
          ".",
          "<",
          ">",
          ":",
          "\"",
          "/",
          "*"
        ]
      },
      "declarationProvider": true,
      "definitionProvider": true,
      "documentFormattingProvider": true,
      "documentHighlightProvider": true,
      "documentLinkProvider": {
        "resolveProvider": false
      },
      "documentOnTypeFormattingProvider": {
        "firstTriggerCharacter": "\n",
        "moreTriggerCharacter": []
      },
      "documentRangeFormattingProvider": true,
      "documentSymbolProvider": true,
      "executeCommandProvider": {
        "commands": [
          "clangd.applyFix",
          "clangd.applyRename",
          "clangd.applyTweak"
        ]
...

```

</details>

https://github.com/llvm/llvm-project/pull/101083