If ld.gold is configured without --enable-thread, ld.gold might not load libpthread.so.
Preloading LLVMgold.so loads also libpthread.so.
llvm-svn: 246739
Parallelism can be enabled using a new plugin option, jobs=N, where N is
the number of code generation threads.
Differential Revision: http://reviews.llvm.org/D12308
llvm-svn: 246584