HandleLLVMOptions.cmake: Typo in comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200498 91177308-0d34-0410-b5e6-96231b3b80d8
[CMake] llvm_update_compile_flags: Honor LLVM_COMPILE_FLAGS.

I accidentally mis-dropped LLVM_COMPILE_FLAGS in r200301. Sorry for that.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200499 91177308-0d34-0410-b5e6-96231b3b80d8