[llvm] [dyndbg][AsmPrinter] Add tail padding attributes (PR #194852)

[Fangrui Song via llvm-commits]

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MaskRay wrote:

This test only exercises MCAsmStreamer. You also want to test -filetype=obj to exercise MCELFStreamer with multiple functions to test that the assembler can handle the complex expression. #190318 demonstrates why alignment with complex conditions can be difficult to handle correctly.

https://github.com/llvm/llvm-project/pull/194852