Adding lld to LLVM_ENABLE_PROJECTS so that we can build/install it.
diff --git a/build_tools/cmake/iree_copts.cmake b/build_tools/cmake/iree_copts.cmake
index 86ded15..78c01c1 100644
--- a/build_tools/cmake/iree_copts.cmake
+++ b/build_tools/cmake/iree_copts.cmake
@@ -440,13 +440,9 @@
 set(LLVM_TARGETS_TO_BUILD "WebAssembly;X86;ARM;AArch64;RISCV;NVPTX;AMDGPU"
     CACHE STRING "" FORCE)
 
-set(LLVM_ENABLE_PROJECTS "mlir" CACHE STRING "" FORCE)
+set(LLVM_ENABLE_PROJECTS "mlir;lld" CACHE STRING "" FORCE)
 set(LLVM_ENABLE_BINDINGS OFF CACHE BOOL "" FORCE)
 
-if(IREE_USE_LINKER)
-  set(LLVM_USE_LINKER ${IREE_USE_LINKER} CACHE STRING "" FORCE)
-endif()
-
 set(MLIR_TABLEGEN_EXE mlir-tblgen)
 # iree-tblgen is not defined using the add_tablegen mechanism as other TableGen
 # tools in LLVM.