Fix misplaced return values (and remove some dead code).
Fix misplaced return values (and remove some dead code).

This was causing disassembly to continue past calls to non-returning functions

BUG=
TEST=

Review URL: https://codereview.appspot.com/6306077

git-svn-id: db59699583a60be9a535cd09cdc9132301867226@900 15e8cca8-e42c-11de-a347-f34a4f72eb7d

google/syzygy,google/syzygy,wangming28/syzygy,pombreda/syzygy,sebmarchand/syzygy,google/syzygy,pombreda/syzygy,supriyantomaftuh/syzygy,wangming28/syzygy,sebmarchand/syzygy,ericmckean/syzygy,pombreda/syzygy,supriyantomaftuh/syzygy,Eloston/syzygy,pombreda/syzygy,supriyantomaftuh/syzygy,google/syzygy,ericmckean/syzygy,sebmarchand/syzygy,ericmckean/syzygy,sebmarchand/syzygy,supriyantomaftuh/syzygy,wangming28/syzygy,ericmckean/syzygy,pombreda/syzygy,wangming28/syzygy,sebmarchand/syzygy,Eloston/syzygy,ericmckean/syzygy