[PathList] Use set and intersect to speed up exact matches

lib/cocoapods/sandbox/path_list.rb

@@ -128,19 +128,21 @@ module Pod
         else
           full_list = files
         end
-
-        list = Array(patterns).map do |pattern|
+        patterns_array = Array(patterns)
+        exact_matches = full_list & patterns_array
+        patterns_array -= exact_matches
+        all_patterns = patterns_array.map do |pattern|
           if directory?(pattern) && dir_pattern
             pattern += '/' unless pattern.end_with?('/')
             pattern += dir_pattern
           end
-          expanded_patterns = dir_glob_equivalent_patterns(pattern)
-          full_list.select do |path|
-            expanded_patterns.any? do |p|
+          dir_glob_equivalent_patterns(pattern)
+        end.flatten
+        list = exact_matches + full_list.select do |path|
+          all_patterns.any? do |p|
             File.fnmatch(p, path, File::FNM_CASEFOLD | File::FNM_PATHNAME)
           end
         end
-        end.flatten
 
         list = list.map { |path| Pathname.new(path) }
         if exclude_patterns