[clang] [Matrix][Clang][HLSL] Move MaxMatrixDimension to a LangOpt (PR #163307)

[Chris B via cfe-commits]

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@@ -159,7 +159,8 @@ void HLSLExternalSemaSource::defineHLSLMatrixAlias() {
                                                   SourceLocation(), ColsParam));
   TemplateParams.emplace_back(ColsParam);
 
-  const unsigned MaxMatDim = 4;
+  const unsigned MaxMatDim = SemaPtr->getLangOpts().MaxMatrixDimension;
+  ;
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llvm-beanz wrote:

Looks like a spurious `;`.

```suggestion
  const unsigned MaxMatDim = SemaPtr->getLangOpts().MaxMatrixDimension;
```

https://github.com/llvm/llvm-project/pull/163307