Use git CHashMap; Trace calls

Still trying to debug the invalid opcode issue. At this point I've
determined that it's probably not specifically my program doing it,
although I'm really not sure.
2 jobs for dependencies in 3 minutes and 3 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
failed #8196
allowed to fail
build:linux:cargo

00:02:21

passed #8197
build:redox:cargo

00:03:03

 
Name Stage Failure
failed
build:linux:cargo Build

error: aborting due to 6 previous errors

For more information about this error, try `rustc --explain E0308`.
error: Could not compile `init`.

Caused by:
process didn't exit successfully: `rustc --edition=2018 --crate-name init src/main.rs --color never --crate-type bin --emit=dep-info,link -C debuginfo=2 -C metadata=23e166105ab4c0b1 -C extra-filename=-23e166105ab4c0b1 --out-dir /builds/redox-os/init/target/debug/deps -C incremental=/builds/redox-os/init/target/debug/incremental -L dependency=/builds/redox-os/init/target/debug/deps --extern chashmap=/builds/redox-os/init/target/debug/deps/libchashmap-fade1ffcb5225375.rlib --extern failure=/builds/redox-os/init/target/debug/deps/libfailure-84a6643815615c78.rlib --extern generational_arena=/builds/redox-os/init/target/debug/deps/libgenerational_arena-82296883cfa3d24a.rlib --extern log=/builds/redox-os/init/target/debug/deps/liblog-b46f7596cd09b0de.rlib --extern syscall=/builds/redox-os/init/target/debug/deps/libsyscall-190654f8d53b8bb9.rlib --extern serde=/builds/redox-os/init/target/debug/deps/libserde-acc688a467bc308c.rlib --extern serde_derive=/builds/redox-os/init/target/debug/deps/libserde_derive-eadd7d3fe57e9cce.so --extern simple_logger=/builds/redox-os/init/target/debug/deps/libsimple_logger-b9f64cad1c47f009.rlib --extern toml=/builds/redox-os/init/target/debug/deps/libtoml-2a514ac0c801e966.rlib -L native=/builds/redox-os/init/target/debug/build/backtrace-sys-9ba51a5fd094d68c/out` (exit code: 1)
ERROR: Job failed: exit code 1