Make IPDBSession::getGlobalScope a non-const method
There doesn't seem to be a compelling reason why this method should be const
other than it was possible with the DIA implementation. The native session
is going to act as a symbol factory and cache. This could be acheived with
mutable (and the existing const_cast), but it seems cleaner to accept that
this method affects the state of the session.
This change eliminates an existing const_cast.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306041
91177308-0d34-0410-b5e6-
96231b3b80d8
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