[PATCH] [ELF] Allow TargetLayout descendants to control assignment sections to segments

[Simon Atanasyan]

Hi ruiu, shankarke,

The TargetLayout class puts two sections into the same segment if they have equal segment types and the same section flags (SHF_xxx). To be able to merge some sort of sections into the same segment we drop some flags before comparison. For example to merge string sections into Data segment we drop SHF_STRINGS and SHF_MERGE flags.

The patch allows TargetLayout descendants to drop some target specific section flags. MIPS target needs that to merge .MIPS.options section which has SHF_MIPS_NOSTRIP flag into the LOAD segment.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9160

Files:
  lib/ReaderWriter/ELF/Mips/MipsTargetLayout.h
  lib/ReaderWriter/ELF/TargetLayout.cpp
  lib/ReaderWriter/ELF/TargetLayout.h
  test/elf/Mips/mips-options-02.test
  test/elf/Mips/mips-options-03.test
  test/elf/Mips/mips-options-04.test
  test/elf/Mips/mips-options-05.test
  test/elf/Mips/mips-options-gp0.test

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