[PATCH] Add driver support for Native Client SDK

[Derek Schuff]

Hi jvoung,

Add Tool and ToolChain support for clang to target the NaCl OS using the NaCl
SDK for x86-32, x86-64 and ARM.

Includes nacltools::Assemble and Link which are derived from gnutools. They
are similar to Linux but different enought that they warrant their own class.
Also includes a NaCl_TC in ToolChains derived from Generic_ELF with library
and include paths suitable for an SDK and independent of the system tools.

http://reviews.llvm.org/D8590

Files:
  lib/Basic/Targets.cpp
  lib/Driver/Driver.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/ToolChains.h
  lib/Driver/Tools.cpp
  lib/Driver/Tools.h
  lib/Frontend/InitHeaderSearch.cpp
  test/Driver/nacl-direct.c

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