Push nested-name-specifier source location information into
UnresolvedLookupExpr and UnresolvedMemberExpr.

Also, improve the computation that checks whether the base of a member
expression (either unresolved or dependent-scoped) is implicit. The
previous check didn't cover all of the cases we use in our
representation, which threw off source-location information for these
expressions (which, in turn, caused some breakage in libclang's token
annotation). 



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@126681 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed