[mlir] Fix 0 values passed to the wrong parameters.

This was found by modernize-use-nullptr ClangTidy check, which suggested
to pass nullptr instead of 0 to DIFileAttr.
However it looks like the intention was to pass the two 0 values for
line and scopeLine, and we should pass {} to DIFileAttr. Do that change.

Author: akuegel

mlir/lib/Dialect/LLVMIR/IR/LLVMAttrs.cpp

@@ -233,7 +233,7 @@ DIRecursiveTypeAttrInterface DISubprogramAttr::withRecId(DistinctAttr recId) {
 
 DIRecursiveTypeAttrInterface DISubprogramAttr::getRecSelf(DistinctAttr recId) {
   return DISubprogramAttr::get(recId.getContext(), recId, /*isRecSelf=*/true,
-                               {}, {}, {}, {}, {}, 0, 0, {}, {}, {}, {}, {});
+                               {}, {}, {}, {}, {}, {}, 0, 0, {}, {}, {}, {});
 }
 
 //===----------------------------------------------------------------------===//