initialize dxil dll in createdxccontainerbuilder

Author: bob80905

tools/clang/tools/dxcompiler/dxcapi.cpp

@@ -60,8 +60,12 @@ HRESULT CreateDxcContainerBuilder(REFIID riid, _Out_ LPVOID *ppv) {
   // Call dxil.dll's containerbuilder
   *ppv = nullptr;
   const char *warning;
-  HRESULT hr = DxilLibCreateInstance(CLSID_DxcContainerBuilder,
-                                     (IDxcContainerBuilder **)ppv);
+  HRESULT hr = DxilLibInitialize();
+  if (FAILED(hr)) {
+    warning = "Unable to load dxil.dll.\n";
+  }
+  hr = DxilLibCreateInstance(CLSID_DxcContainerBuilder,
+                             (IDxcContainerBuilder **)ppv);
   if (FAILED(hr)) {
     warning = "Unable to create container builder from dxil.dll. Resulting "
               "container will not be signed.\n";