[PATCH] MC: Support larger COFF string tables

[Nico Rieck]

Hi asl,

The COFF object writer currently supports only relatively small string tables because it only uses the single-slash encoding with up to 6 digits.

This patch extends this to the full 7 digits, bumping the supported table size from ~1MB to ~9.5MB. It also implements the undocumented double-slash encoding using base 64 encoded offsets for even larger offsets.

http://llvm-reviews.chandlerc.com/D667

Files:
  lib/MC/WinCOFFObjectWriter.cpp
  lib/Object/COFFObjectFile.cpp
  test/MC/COFF/lit.local.cfg
  test/MC/COFF/section-name-encoding.test
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