llvm-dwarfdump: implement --recurse-depth=<N>

llvm-dwarfdump: implement --recurse-depth=<N>

This patch implements the Darwin dwarfdump option --recurse-depth=<N>,
which limits the recursion depth when selectively printing DIEs at an
offset.

Differential Revision: https://reviews.llvm.org/D38064

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313778 91177308-0d34-0410-b5e6-96231b3b80d8