[llvm] r229841 - Reverting r229831 due to multiple ARM/PPC/MIPS build-bot failures.

[Richard Barton]

Hi Daniel

Now that 5.0.2 is released, would now be a good time to try updating the GCC
version on the MIPS buldbot so Michael can try to land r233055 again?

Michael: was this the only problem bot remaining?

Ta
Rich