[clang-tools-extra] [clangd][HLSL] Add hover support for vector swizzle and matrix element access (PR #212741)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang-tools-extra/clangd/Hover.cpp clang-tools-extra/clangd/unittests/HoverTests.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clangd/Hover.cpp b/clang-tools-extra/clangd/Hover.cpp
index f475e2d5e..de73ea058 100644
--- a/clang-tools-extra/clangd/Hover.cpp
+++ b/clang-tools-extra/clangd/Hover.cpp
@@ -951,9 +951,8 @@ llvm::StringLiteral getNameForExpr(const Expr *E) {
 void maybeAddCalleeArgInfo(const SelectionTree::Node *N, HoverInfo &HI,
                            const PrintingPolicy &PP);
 
-static std::optional<HoverInfo> getHLSLHoverContents(const Expr *E,
-                                                      ParsedAST &AST,
-                                                      const PrintingPolicy &PP) {
+static std::optional<HoverInfo>
+getHLSLHoverContents(const Expr *E, ParsedAST &AST, const PrintingPolicy &PP) {
   HoverInfo HI;
   if (const auto *VecExpr = dyn_cast<ExtVectorElementExpr>(E)) {
     HI.Name = VecExpr->getAccessor().getName().str();

``````````

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https://github.com/llvm/llvm-project/pull/212741