added llvm 3.4.2.

download: http://llvm.org/releases/3.4.2/llvm-3.4.2.src.tar.gz
added compiler-rt 3.4 to llvm.

download: http://llvm.org/releases/3.4/compiler-rt-3.4.src.tar.gz
added cfe 3.4.2 to llvm.

download: http://llvm.org/releases/3.4.2/cfe-3.4.2.src.tar.gz