[PATCH] Support arm32 R_ARM_V4BX relocation format

[Adhemerval Zanella]

Hi ruiu, shankar.easwaran,

ARM32 ELF R_ARM_V4BX relocation format is a special relocation type
that records the location of an ARMv4t BX instruction to enable a
static linker to generate ARMv4 compatible instructions.  This
relocation does not contain a reference symbol.

This patch enabled its creation by removing the requeriment of a
relocation symbol target in ELFState<ELFT>::writeSectionContent.

http://reviews.llvm.org/D9162

Files:
  test/Object/yaml2obj-elf-rel-noref.yaml
  tools/yaml2obj/yaml2elf.cpp

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