[clang] [HLSL] Implement array temporary support (PR #79382)

[Eli Friedman via cfe-commits]

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@@ -10926,6 +10965,10 @@ QualType ASTContext::mergeTypes(QualType LHS, QualType RHS, bool OfBlockPointer,
     assert(LHS != RHS &&
            "Equivalent pipe types should have already been handled!");
     return {};
+  case Type::ArrayParameter:
+    assert(LHS != RHS &&
+           "Equivalent pipe types should have already been handled!");
+    return LHS;
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efriedma-quic wrote:

`return {};`?  Also, assertion text is wrong.

You could try to merge like we do for ConstantArray... but it's unlikely to matter, since HLSL is a C++ variant (and type merging is basically a C-only thing).

https://github.com/llvm/llvm-project/pull/79382