Import compiler-rt r215309. Extends 128bit IEEE support in soft-float,
uses Thumb mode by default on ARM when available and fixes a bug in the
division code for ARMs with hardware integer division.
Import LLVM 3.6svn r215315.
Import clang 3.6svn r215315.
Mark files without clang-215315 tag as dead.
Mark files without llvm-215315 tag as dead.