[PATCH] Support cross-compiling for Arm on x86

[Sriram Murali]

  Good catch Renato. I didn't update the summary. I stuck to the original one from the old patch.. Here is the updated one

  Summary:
  This patch extends cross-compiling facility for Arm devices on x86 linux machine particularly for .cpp source files. It adds appropriate include paths containing headers for cross-compilation. On Ubuntu (possibly Debian), this will be in /usr/arm-linux-gnueabi

http://llvm-reviews.chandlerc.com/D2040