[DirectX] XFAIL test failing because of debuginfo changes (#135279)

For more context see
https://discourse.llvm.org/t/psa-ir-output-changing-from-debug-intrinsics-to-debug-records/79578

This change:
6a45fce
broke this test:
https://github.com/llvm/llvm-project/blob/main/llvm/test/tools/dxil-dis/debug-info.ll
in our pipeline:
https://github.com/llvm/llvm-project/actions/workflows/hlsl-matrix.yaml

LLVM is transitioning off of the llvm.dbg.value debug intrinsic in favor
of the `#dbg_declare(..) format. see
https://github.com/llvm/llvm-project/pull/133917/files

dxil-dis does not understand the new format and so work needs to be
planned out to support this transition in
https://github.com/microsoft/DirectXShaderCompiler

For now the fix is to XFAIL this test to unblock the pipeline.

Author: farzonl

llvm/test/tools/dxil-dis/debug-info.ll

@@ -1,4 +1,7 @@
 ; RUN: llc --filetype=obj %s -o  - -experimental-debuginfo-iterators=false | dxil-dis -o - | FileCheck %s
+; Note: LLVM has soft disabled experimental-debuginfo-iterators in commit 6a45fce
+; XFAIL: *
+
 target triple = "dxil-unknown-shadermodel6.7-library"
 target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"