[llvm] [DirectX][ObjectYAML] Attempt to fix flaky PRIVPart.yaml (PR #206278)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-objectyaml

Author: Vladislav Dzhidzhoev (dzhidzhoev)

<details>
<summary>Changes</summary>

This test was meant to round-trip YAML twice, to ensure correct processing of non-4-byte-padded PRIV section.
However, second invocation of yaml2obj had wrong arguments (it was reading from test file instead of stdin). Fix that.

Also, round-trips were split into two RUN lines, to make it clear on which line an error occurs if the test is still flaky.

---
Full diff: https://github.com/llvm/llvm-project/pull/206278.diff


1 Files Affected:

- (modified) llvm/test/tools/obj2yaml/DXContainer/PRIVPart.yaml (+2-1) 


``````````diff
diff --git a/llvm/test/tools/obj2yaml/DXContainer/PRIVPart.yaml b/llvm/test/tools/obj2yaml/DXContainer/PRIVPart.yaml
index 0d429a1381413..72db3f55b37b4 100644
--- a/llvm/test/tools/obj2yaml/DXContainer/PRIVPart.yaml
+++ b/llvm/test/tools/obj2yaml/DXContainer/PRIVPart.yaml
@@ -2,7 +2,8 @@
 ## part size is not a multiple of 4. The pipeline is run twice to ensure obj2yaml
 ## output with a non-multiple-of-4 FileSize can be fed back through yaml2obj.
 
-# RUN: yaml2obj %s 2>&1 | obj2yaml 2>&1 | yaml2obj %s 2>&1 | obj2yaml 2>&1 | FileCheck %s
+# RUN: yaml2obj %s 2>&1 | obj2yaml -o %t.yaml
+# RUN: yaml2obj %t.yaml 2>&1 | obj2yaml 2>&1 | FileCheck %s
 
 --- !dxcontainer
 Header:

``````````

</details>


https://github.com/llvm/llvm-project/pull/206278