[PATCH] Add zlib (un)compression routines to LLVM

[Alexey Samsonov]

Hi echristo, Bigcheese,

This patch allows LLVM to detect whether ZLib is present in the system
(for now in CMake build only), and extends LLVMSupport with compression/uncompression
routines. Later I plan to use them in LLVMObject library to uncompress debug info sections.

http://llvm-reviews.chandlerc.com/D683

Files:
  include/llvm/Support/Compression.h
  include/llvm/Config/config.h.cmake
  unittests/Support/CMakeLists.txt
  unittests/Support/CompressionTest.cpp
  lib/Support/Compression.cpp
  lib/Support/CMakeLists.txt
  CMakeLists.txt
  cmake/config-ix.cmake
  cmake/modules/LLVMConfig.cmake.in
  cmake/modules/LLVM-Config.cmake
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