[clang] [lldb] [llvm] [HLSL] Add Packed Types for pack_ and unpack_ intrinsics (PR #224277)

[Kaitlin Peng via cfe-commits]

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@@ -2345,6 +2347,46 @@ static bool IsVectorConversion(Sema &S, QualType FromType, QualType ToType,
   return false;
 }
 
+static bool IsHLSLPackedTypeConversion(Sema &S, QualType FromType,
+                                       QualType ToType,
+                                       ImplicitConversionKind &ICK,
+                                       ImplicitConversionKind &DimensionICK,
+                                       Expr *From) {
+  if (!S.getLangOpts().HLSL)
+    return false;
+  if (S.Context.hasSameUnqualifiedType(FromType, ToType))
+    return false;
+
+  QualType UIntTy = S.Context.UnsignedIntTy;
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kmpeng wrote:

nit: move this down to where `ToIsUint` and `FromIsUint` are since it's not used until then

https://github.com/llvm/llvm-project/pull/224277