[CFE] Add a few helper utils These ease my life slightly. Examples: Compile to executable to get faster runs: ``` out/ReleaseX64/dart-sdk/bin/dart compile exe pkg/front_end/tool/gitformat_cl.dart -o ~/bin/format_cl out/ReleaseX64/dart-sdk/bin/dart compile exe pkg/front_end/tool/git_branch_helper.dart -o ~/bin/gitbranch ``` Now I can format my entire CL with ``` $ format_cl Using file:///path/to/dart-sdk/sdk/out/ReleaseX64/dart stdout> Formatted 3 files (0 changed) in 0.35 seconds. ``` and get info about my branching with ``` $ gitbranch ├── origin/main │ ├── add_a_few_cfe_util_tools [ahead 2] ``` Change-Id: I2e89196ab702660a1486894d22678e3cd0c07994 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/352641 Reviewed-by: Chloe Stefantsova <cstefantsova@google.com> Commit-Queue: Jens Johansen <jensj@google.com>
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