CMake: make sure compiler-rt headers are copied to build tree if 'compilrer-rt' target is built
CMake: make sure compiler-rt headers are copied to build tree if 'compilrer-rt' target is built

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@195002 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt