[gn build] Add build files for llvm-as, llvm-dis, llvm-dwarfdump, llvm-mc, FileCheck, count, not

These executables are needed by check-lld.

Differential Revision: https://reviews.llvm.org/D55688


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349289 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed