Add memoize decorator to gyp.common, and use it for RelativePath() which is hot (and nontrivial).
Add memoize decorator to gyp.common, and use it for RelativePath() which is hot (and nontrivial).

This speeds up reading gyp input files 10s -> 8.5s for chromium.
Patch by Viet-Trung Luu <viettrungluu@chromium.org>


old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google