rustpkg tests have too much output by default

[brson]

It is emitting lots of this:

time: 0.004 s   translation
time: 0.008 s   LLVM passes
warning: no debug symbols in executable (-arch x86_64)
time: 0.061 s   linking
note: build_crates: compiling src/bar-0.1/bench.rs
note: build_crates: destination dir is ./build/bar
time: 0.000 s   parsing
time: 0.007 s   expansion
time: 0.000 s   configuration
time: 0.000 s   maybe building test harness
time: 0.003 s   intrinsic injection
time: 0.000 s   extra injection
time: 0.000 s   ast indexing
time: 0.171 s   external crate/lib resolution
time: 0.000 s   language item collection
time: 0.181 s   resolution
time: 0.000 s   looking for entry point
time: 0.000 s   freevar finding
time: 0.000 s   region resolution
time: 0.000 s   region parameterization inference
time: 0.001 s   type collecting
time: 0.117 s   coherence checking
time: 0.001 s   type checking
time: 0.000 s   const marking
time: 0.000 s   const checking
time: 0.000 s   privacy checking
time: 0.000 s   effect checking
time: 0.000 s   loop checking
time: 0.000 s   compute moves
time: 0.000 s   match checking
time: 0.000 s   liveness checking
time: 0.000 s   borrow checking
time: 0.000 s   kind checking
time: 0.000 s   lint checking
time: 0.003 s   translation
time: 0.009 s   LLVM passes
warning: no debug symbols in executable (-arch x86_64)
time: 0.047 s   linking
time: 0.005 s   intrinsic injection
time: 0.000 s   extra injection
time: 0.000 s   ast indexing
time: 0.113 s   external crate/lib resolution
time: 0.000 s   language item collection
time: 0.113 s   resolution
time: 0.000 s   looking for entry point
time: 0.000 s   freevar finding
time: 0.000 s   region resolution
time: 0.000 s   region parameterization inference
time: 0.001 s   type collecting
time: 0.080 s   coherence checking
time: 0.000 s   type checking
time: 0.000 s   const marking
time: 0.000 s   const checking
time: 0.000 s   privacy checking
time: 0.000 s   effect checking
time: 0.000 s   loop checking
time: 0.000 s   compute moves
time: 0.000 s   match checking
time: 0.000 s   liveness checking
time: 0.000 s   borrow checking
time: 0.000 s   kind checking
time: 0.000 s   lint checking
time: 0.001 s   translation
time: 0.003 s   LLVM passes
warning: no debug symbols in executable (-arch x86_64)
time: 0.083 s   linking
note: build_crates: compiling src/foo-0.1/test.rs
note: build_crates: destination dir is ./build/foo
time: 0.000 s   parsing
time: 0.006 s   expansion
time: 0.000 s   configuration
time: 0.001 s   maybe building test harness
time: 0.002 s   intrinsic injection
time: 0.000 s   extra injection
time: 0.000 s   ast indexing
time: 0.127 s   external crate/lib resolution
time: 0.000 s   language item collection
time: 0.137 s   resolution
time: 0.000 s   looking for entry poin

It's hard to tell what the results are because there's a lot of information.

[catamorphism]

Yeah, I can take out the -Z time-passes (which I just added for debugging) pretty easily.