[tools] Introduce llvm-strip

llvm-strip is supposed to be a drop-in replacement for binutils strip.
To start the ball rolling this diff adds the initial bits for llvm-strip,
more features will be added incrementally over time.

Test plan: make check-all

Differential revision: https://reviews.llvm.org/D46407



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331663 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed