[llvm] [DXContainer] Update DXContainer to match D3D12 spec (PR #143201)

[via llvm-commits]

================
@@ -78,7 +78,6 @@ ROOT_ELEMENT_FLAG(11, SamplerHeapDirectlyIndexed)
 // ROOT_DESCRIPTOR_FLAG(bit offset for the flag, name).
 #ifdef ROOT_DESCRIPTOR_FLAG
 
-ROOT_DESCRIPTOR_FLAG(0, NONE)
----------------
joaosaffran wrote:

I've removed all shift related values, now we use the hex directly in table gen. In order to make it more straight forward. 

https://github.com/llvm/llvm-project/pull/143201