Merge pull request #1920 from freechipsproject/bump-firrtl

Summary of changes:
* No longer reports exceptions in custom transforms as internal errors
* Error on registers with flip in type
* Add `--nodedup` command line option to turn of dedup
* Fix gnarly bug in checking component "initialization"
* Add data structure for repl-seq-mems file format
* DCE removes printf and stop with constant-0 enables
* Faster register constant propagation