[DXIL] Add support for root signature flag element in DXContainer (#123147)

Adding support for Root Signature Flags Element extraction and writing
to DXContainer.
- Adding an analysis to deal with RootSignature metadata definition
- Adding validation for Flag
- writing RootSignature blob into DXIL

Closes: [126632](https://github.com/llvm/llvm-project/issues/126632)

---------

Co-authored-by: joaosaffran <joao.saffran@microsoft.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp b/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
index ecb1bf7..a76c07f 100644
--- a/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
+++ b/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
@@ -19,6 +19,7 @@
 #include "DXILPrettyPrinter.h"
 #include "DXILResourceAccess.h"
 #include "DXILResourceAnalysis.h"
+#include "DXILRootSignature.h"
 #include "DXILShaderFlags.h"
 #include "DXILTranslateMetadata.h"
 #include "DXILWriter/DXILWriterPass.h"
@@ -61,6 +62,7 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeDirectXTarget() {
   initializeDXILTranslateMetadataLegacyPass(*PR);
   initializeDXILResourceMDWrapperPass(*PR);
   initializeShaderFlagsAnalysisWrapperPass(*PR);
+  initializeRootSignatureAnalysisWrapperPass(*PR);
   initializeDXILFinalizeLinkageLegacyPass(*PR);
 }