[cmake/multilib] Support multilib libdir suffixes by applying the LLVM_LIBDIR_SUFFIX variable to one place in the cmake file.
[cmake/multilib] Support multilib libdir suffixes by applying the
LLVM_LIBDIR_SUFFIX variable to one place in the cmake file.

This is all that I had to do to get everything from compiler-rt working
for me, but there may be more work required if folks are relying on more
parts of compiler-rt. Notably, I'm mostly using it for the sanitizers.

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@224928 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