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[ELF] - Recommit r273143("[ELF] - Basic versioned symbols support implemented.")

Description

[ELF] - Recommit r273143("[ELF] - Basic versioned symbols support implemented.")

With fix:
-soname flag was not set in testcase. Hash calculated for base def was different on local
and bot machines because filename fos used for calculating.

Initial commit message:
Patch implements basic support of versioned symbols.
There is no wildcards patterns matching except local: *;
There is no support for hierarchies.
There is no support for symbols overrides (@ vs @@ not handled).

This patch allows programs that using simple scripts to link and run.

Differential revision: http://reviews.llvm.org/D21018

Details