improve performance when handling unused variables in `collapse_vars` (#3084)
authorAlex Lam S.L <alexlamsl@gmail.com>
Sun, 15 Apr 2018 04:38:31 +0000 (12:38 +0800)
committerGitHub <noreply@github.com>
Sun, 15 Apr 2018 04:38:31 +0000 (12:38 +0800)
commit7362f579666194aed000005c956f2e0e83c9a87d
tree21f618b15e13232bca4da008039f05f7e5b06c9b
parenteaa2c1f6af10e08c9ece097bfb8c1f15a74ffa28
improve performance when handling unused variables in `collapse_vars` (#3084)

fixes #3082
lib/compress.js