[PATCH] D95932: [Debug-Info] [NFC] move emitDwarfUnitLength to MCStreamer class

[ChenZheng via Phabricator via llvm-commits]

shchenz created this revision.
shchenz added reviewers: ikudrin, hubert.reinterpretcast, jsji, PowerPC, echristo.
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We may need to do some customization for DWARF unit length in DWARF section headers for some code generation path. 
For example in D95518 <https://reviews.llvm.org/D95518>, for XCOFF in assembly path, AIX assembler does not require the debug section containing its debug unit length in the header.

Thanks to @ikudrin comments, moving the `emitDwarfUnitLength` to class `MCStreamer` can make us avoid the streamer type check in general code.

This is the NFC part to make D95518 <https://reviews.llvm.org/D95518> easy to review. 
Override of  `emitDwarfUnitLength` in `MCAsmStreamer` class will be added in D95518 <https://reviews.llvm.org/D95518>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D95932

Files:
  llvm/include/llvm/CodeGen/AsmPrinter.h
  llvm/include/llvm/MC/MCStreamer.h
  llvm/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
  llvm/lib/MC/MCStreamer.cpp
  llvm/unittests/CodeGen/AsmPrinterDwarfTest.cpp

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