translate-c: Fix performance hazard in transPreprocessorEntities
Fixes O(N^2) behavior of `transPreprocessorEntities` due to repeated calls to
`mem.len`
Closes #8959
a9dd8d7543Evan Haas committed on 6/2/2021, 6:12:45 AM· committed by Veikka Tuominenparentc6a0a4e