[PATCH] D24616: [ELF] Improve section GC for comdat groups

[Eugene Leviant via llvm-commits]

evgeny777 created this revision.
evgeny777 added reviewers: ruiu, rafael.
evgeny777 added subscribers: grimar, llvm-commits.
evgeny777 set the repository for this revision to rL LLVM.
evgeny777 added a project: lld.

This patch fixes two things

1) If any section within comdat group is marked Live an entire group is marked live.
2) On some occasions GC may crash if symbol references section which is a member of comdat group. This happens in case compiler creates section relocation, i.e:

```
leaq    .text._Z3fooIiEvv(%rip), %rax
```


Repository:
  rL LLVM

https://reviews.llvm.org/D24616

Files:
  ELF/InputFiles.cpp
  ELF/InputFiles.h
  ELF/MarkLive.cpp
  test/ELF/Inputs/comdat-gc.s
  test/ELF/comdat-gc.s

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