Pull in r177252 from upstream clang trunk:
Pull in r177252 from upstream clang trunk:

 Make sure to use same EABI version for external assembler as for
 integrated as.

This allows us to use gcc on a world built with clang on ARM.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase