Build Error on MIPS + workaround

LLVM 2.6 does not build on (at least my) MIPS, because "mips" is #defined by the existing toolchain, but LLVM tries to use it as a symbol. This works around it:

CPPFLAGS=-Umips make

The problem is in llvm/ADT/Triple.h, line 57.


Mainline has a fix for that by undefing the symbol in that file up near the top.