1. Module.current points to topComponent, which enables when statements in the backend 2. add an parameter to passes, which makes it easy to add them to transforms
support adding modules in the backend
fix dfs & bfs, and do not check assign in the backend
move checkpoint
addPin in the backend
fix minors
remove param of verifyAllMuxes
addPin & addModule in a module
fix signal emission problems from the debug option
Merge branch 'master' of github.com:ucb-bar/chisel
Merge pull request #256 from ucb-bar/transforms

Transforms
Merge branch 'master' into cpluspartition