tree ab246a4dee2fdbc4ae490cda83599a5f5f980b27
parent 4c057caa84dc5e1bc6bf0d9fe8af9180a6151e07
author Joe Tsai <joetsai@digital-static.net> 1543960801 -0800
committer Joe Tsai <thebrokentoaster@gmail.com> 1543968856 +0000

internal/legacy: improve performance of extension descriptor conversions

Converting to/from v1/v2 extension descriptor types is a common operation
for v1 and v2 interoperability. Optimize these operations with a cache.

Change-Id: I5feca810f60376847c791654982acd3b6a37a5db
Reviewed-on: https://go-review.googlesource.com/c/152542
Reviewed-by: Herbie Ong <herbie@google.com>