Fix build with LLVM 3.4

F_Binary and friends were moved to include/Support/FileSystem.h

v2: Maintain compatibility with LLVM 3.3

Signed-off-by: Aaron Watry <awatry@gmail.com>

git-svn-id: https://llvm.org/svn/llvm-project/libclc/trunk@186610 91177308-0d34-0410-b5e6-96231b3b80d8