llvm-dwarfdump --statistics: Unique abstract origins across multiple CUs.

Instead of indexing local variables by DIE offset, use the variable
name + the path through the lexical block tree. This makes the lookup
key consistent across duplicate abstract origins in different CUs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342776 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed