refactor hex-tilde-alternate to split out lexing

note that lexing of the body of a magic comment was already separate, part of hex-tilde-replacement. however, hex-tilde-alternate had been responsible for lexing the sequence that introduces a magic comment. because we want to make separate versions of the alternate for each inner transform, the lexing needed to be factored out.

this does result in more copying, but it doesn't appear to noticeably affect runtime.

Force-Push: yes
Change-Id: I51a780d1dadb99f09bddb9eaccb1af387bd0ce87

0 files changed, 0 insertions, 0 deletions