Add LLVM_ENABLE_LLD option to use LLD as C/C++ linker.

Differential revision: https://reviews.llvm.org/D22896


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277093 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed