[llvm] [DirectX] adding support to read/write descriptor table data using obj2yaml/yaml2obj (PR #138315)

[Justin Bogner via llvm-commits]

================
@@ -228,6 +273,19 @@ class RootSignature {
       else
         DataSize = sizeof(dxbc::RTS0::v2::RootDescriptor);
       break;
+    case dxbc::RootParameterType::DescriptorTable:
+      uint32_t NumRanges =
+          support::endian::read<uint32_t, llvm::endianness::little>(
+              PartData.begin() + Header.ParameterOffset);
----------------
bogner wrote:

It's a bit unfortunate that we need to read the data here in order to parse it. Do we do anything elsewhere to make sure that corrupted data doesn't bite us here? That is, does this do something reasonable for an absurdly large incorrect size or does it fall over?

https://github.com/llvm/llvm-project/pull/138315