[include-fixer] Add usage count to find-all-symbols.

Summary:
Add usage count to find-all-symbols.

FindAllSymbols now finds (most!) main-file usages of the discovered symbols.
The per-TU map output has NumUses=0 or 1 (only one use per file is counted).
The reducer aggregates these to find the number of files that use a symbol.

The NumOccurrences is now set to 1 in the mapper rather than being inferred by
the reducer, for consistency.

The idea here is to use NumUses for ranking: intuitively number of files that
use a symbol is more meaningful than number of files that include the header.

Reviewers: hokein, bkramer

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D30210

llvm-svn: 296446

1 files changed, 1 insertions, 2 deletions

diff --git a/clang-tools-extra/include-fixer/IncludeFixer.cpp b/clang-tools-extra/include-fixer/IncludeFixer.cpp
index 1944d73f63c..ca4d863d3ad 100644
--- a/clang-tools-extra/include-fixer/IncludeFixer.cpp
+++ b/clang-tools-extra/include-fixer/IncludeFixer.cpp
@@ -334,8 +334,7 @@ IncludeFixerContext IncludeFixerSemaSource::getIncludeFixerContext(
         SourceManager, HeaderSearch);
     SymbolCandidates.emplace_back(Symbol.getName(), Symbol.getSymbolKind(),
                                   MinimizedFilePath, Symbol.getLineNumber(),
-                                  Symbol.getContexts(),
-                                  Symbol.getNumOccurrences());
+                                  Symbol.getContexts());
   }
   return IncludeFixerContext(FilePath, QuerySymbolInfos, SymbolCandidates);
 }