[PATCH] D54614: [WebAssembly] Fix MCNullStreamer support

[Eugene Sharygin via Phabricator via llvm-commits]

eush created this revision.
eush added reviewers: aheejin, dschuff.
Herald added subscribers: sunfish, jgravelle-google, sbc100.

This fixes crashes in AsmPrinter when using
MCNullStreamer (`-filetype=null`).


Repository:
  rL LLVM

https://reviews.llvm.org/D54614

Files:
  lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
  test/CodeGen/WebAssembly/null-streamer.ll

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