Merge pull request git-for-windows#1827 from benpeart/fscache_refresh_index

Enable the filesystem cache (fscache) in refresh_index().

Author: dscho

read-cache.c

@@ -1496,6 +1496,7 @@ int refresh_index(struct index_state *istate, unsigned int flags,
 	typechange_fmt = (in_porcelain ? "T\t%s\n" : "%s needs update\n");
 	added_fmt = (in_porcelain ? "A\t%s\n" : "%s needs update\n");
 	unmerged_fmt = (in_porcelain ? "U\t%s\n" : "%s: needs merge\n");
+	enable_fscache(1);
 	/*
 	 * Use the multi-threaded preload_index() to refresh most of the
 	 * cache entries quickly then in the single threaded loop below,
@@ -1573,6 +1574,7 @@ int refresh_index(struct index_state *istate, unsigned int flags,
 		stop_progress(&progress);
 	}
 	trace_performance_leave("refresh index");
+	enable_fscache(0);
 	return has_errors;
 }