[PATCH] [lld] [ELF/Aarch64 v2] Fix correct TCB aligment calculation

[Adhemerval Zanella]

Hi ruiu, shankar.easwaran,


This is an updated patch and it fixes the TLS local relocations alignment
done by @238258. As pointed out, the TLS size should not be considered,
but rather the TCB size based on maximum output segment alignment. 
Although it has not shown in the TLS simple cases for test-suite, more
comprehensible tests with more local TLS variable showed wrong relocations 
values being generated.

The local TLS testcase is expanded to add more tls variable (both
exported and static) initialized or not.

Differences from first version:

* Using C++11 initialization mechanism for _tpOff
* Only considering TLS segments for TCB alignment
* Remove some 'auto' usage.

http://reviews.llvm.org/D10121

Files:
  lib/ReaderWriter/ELF/AArch64/AArch64RelocationHandler.cpp
  lib/ReaderWriter/ELF/AArch64/AArch64RelocationHandler.h
  lib/ReaderWriter/ELF/AArch64/AArch64TargetHandler.h
  test/elf/AArch64/local-tls.test

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