[llvm] [ObjCopy][DX] Support for -dump-section flag (PR #159999)

[James Henderson via llvm-commits]

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jh7370 wrote:

I'm okay with switching to .yaml for DXContainer tests, if you prefer (as long as they contain YAML, obviosuly). At the time llvm-objcopy was being brought up,".yaml" wasn't recognised as a test file extension, hence the generic ".test" was used.

https://github.com/llvm/llvm-project/pull/159999