[ClangCL] fix clang-cl build warning. (#6492)

Fix sign-compare warnings.

lib/DxilContainer/DxilContainer.cpp

@@ -98,7 +98,8 @@ bool IsValidDxilContainer(const DxilContainerHeader *pHeader, size_t length) {
   }
 
   // Container size should match end of last part
-  if (nextPartBegin - pLinearContainer != pHeader->ContainerSizeInBytes)
+  if ((uint32_t)(nextPartBegin - pLinearContainer) !=
+      pHeader->ContainerSizeInBytes)
     return false;
 
   return true;

lib/DxilContainer/DxilContainerAssembler.cpp

@@ -610,7 +610,7 @@ void hlsl::StoreViewIDStateToPSV(const uint32_t *pInputData,
                                          PSVComponentMask(),
                                          PSV.GetPCInputToOutputTable());
   }
-  DXASSERT(pSrc - pInputData == InputSizeInUInts,
+  DXASSERT((unsigned)(pSrc - pInputData) == InputSizeInUInts,
            "otherwise, different amout of data written than expected.");
 }
 
@@ -667,7 +667,7 @@ unsigned hlsl::LoadViewIDStateFromPSV(unsigned *pOutputData,
         pOutputData, PCScalars, OutputScalars[0], PSVComponentMask(),
         PSV.GetPCInputToOutputTable());
   }
-  DXASSERT(pOutputData - pStartOutputData == OutputSizeInUInts,
+  DXASSERT((unsigned)(pOutputData - pStartOutputData) == OutputSizeInUInts,
            "otherwise, OutputSizeInUInts didn't match size written.");
   return pOutputData - pStartOutputData;
 }