[clang] [HLSL] Implement '__builtin_hlsl_is_intangible' type trait (PR #104544)

[Justin Bogner via cfe-commits]

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@@ -5683,6 +5685,14 @@ static bool EvaluateUnaryTypeTrait(Sema &Self, TypeTrait UTT,
         return true;
     return false;
   }
+  case UTT_IsIntangibleType:
+    if (!T->isVoidType() && !T->isIncompleteArrayType())
+      if (Self.RequireCompleteType(TInfo->getTypeLoc().getBeginLoc(), T,
+                                   diag::err_incomplete_type))
+        return false;
+    DiagnoseVLAInCXXTypeTrait(Self, TInfo,
+                              tok::kw___builtin_hlsl_is_intangible);
+    return Self.HLSL().IsIntangibleType(T);
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bogner wrote:

I guess we don't need to check that the language is HLSL here since the type trait only exists in HLSL mode? It might be nice to put an assert here in case that ever changes for some reason.

https://github.com/llvm/llvm-project/pull/104544