[ICE] with -Z perf-stats

[leonardo-m]

...>rustc -Z perf-stats my_test.rs
Total time spent computing SVHs:               0.000
Total time spent computing incr. comp. hashes: 0.000
Total number of incr. comp. hashes computed:   0
Total number of bytes hashed for incr. comp.:  0
error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: rustc 1.24.0-nightly (f8af59d95 2017-12-13) running on x86_64-pc-windows-gnu
thread 'rustc' panicked at 'attempt to divide by zero', src\librustc\session\mod.rs:639:18