Add dx option to always generate const-string/jumbo.do not merge.

This allows large dex files with many strings to be merged properly.

(cherry picked from commit 266f45ff7da18022faf5f77df76c69f8cdad313f)

Change-Id: I5fe4c55d84a91101a4f89f590117aa6dc0bfc0f2
5 files changed