The compiler got a bit slower:

https://github.com/golang/go/issues/19386

Those numbers are just for my CLs that fix stack traces but with mid-stack inlining still off. Turning it on makes builds noticeably slower:

    $ time ./make.bash
    real: 45.32s  user: 118.67s  cpu: 5.85s

    $ time GO_GCFLAGS='-l=4' ./make.bash
    real: 64.51s  user: 167.04s  cpu: 7.12s

We'll need to tweak the inlining heuristic to find a good balance between performance, build times, and binary size.