[llvm-strip] Add missing aliases for --strip-debug

Add missing aliases for --strip-debug: -g, -S, -d.

Test plan: make check-all

Differential revision: https://reviews.llvm.org/D47674


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333940 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed