[PATCH] D47238: [WebAssembly] Fix crash when relocation synbol is not live

[Sam Clegg via Phabricator via llvm-commits]

sbc100 created this revision.
Herald added subscribers: llvm-commits, JDevlieghere, sunfish, aheejin, jgravelle-google, aprantl, dschuff.

When a symbol is GC'd it can still be references by relocations
in the debug sections, but such symbols are not assigned virtual
addresses.

This change adds a new global data symbol which gets gc'd but
should still appears in the output debug info, albeit with a 0
address.

Fixes 37555


Repository:
  rLLD LLVM Linker

https://reviews.llvm.org/D47238

Files:
  test/wasm/Inputs/debuginfo1.ll
  test/wasm/Inputs/debuginfo2.ll
  test/wasm/debuginfo.test
  wasm/InputFiles.cpp

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