[llvm] [DXIL] Adding support to RootSignatureFlags in obj2yaml (PR #122396)

[Chris B via llvm-commits]

================
@@ -0,0 +1,242 @@
+# RUN: yaml2obj %s | obj2yaml | FileCheck %s
+--- !dxcontainer
+Header:
+  Hash:            [ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 
+                     0x0, 0x0, 0x0, 0x0, 0x0, 0x0 ]
+  Version:
+    Major:           1
+    Minor:           0
+  FileSize:        1672
+  PartCount:       7
+  PartOffsets:     [ 60, 1496, 1512, 1540, 1556, 1572, 1588 ]
+Parts:
----------------
llvm-beanz wrote:

It is valid to have a root signature in a container by itself, so you shouldn't need a bunch of different parts. This test is an example of generating a root-signature-only container:

https://github.com/microsoft/DirectXShaderCompiler/blob/main/tools/clang/test/DXC/local_rs.hlsl

https://github.com/llvm/llvm-project/pull/122396