[dexp] Change FuzzyFind to also print scope of symbols

Summary:
When there are multiple symbols in the result of a fuzzy find with the
same name, one has to perform an additional query to figure out which of those
symbols are coming from the "interesting" scope. This patch prints the scope in
fuzzy find results to get rid of the second symbol.

Reviewers: hokein

Subscribers: ilya-biryukov, ioeric, jkorous, arphaman, cfe-commits

Differential Revision: https://reviews.llvm.org/D55705

llvm-svn: 349152