[PATCH] D21556: [ELF] - Implemented version script hierarchies.

[George Rimar via llvm-commits]

grimar created this revision.
grimar added reviewers: ruiu, rafael.
grimar added subscribers: llvm-commits, grimar.

Patch implements hierarchies for version scripts. 
This allows to handle script files with dependencies, like next one has:

```
LIBSAMPLE_1.0{
  global:
  a;
};

LIBSAMPLE_2.0
{
  global:
  b;
}LIBSAMPLE_1.0;
```

http://reviews.llvm.org/D21556

Files:
  ELF/Config.h
  ELF/OutputSections.cpp
  ELF/SymbolListFile.cpp
  test/ELF/verdef-dependency.s

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