analysis server has undeclared inputs

[rmacnak-google]

$ export RBE_exec_strategy=remote
$ ./tools/build.py -m release create_sdk
...
Analyzing ../../pkg/compiler/lib...
  error • Target of URI doesn't exist: 'package:shell_arg_splitter/shell_arg_splitter.dart' at ../../pkg/compiler/lib/src/dart2js.dart:14:8 • (uri_does_not_exist)
  error • The function 'splitLine' isn't defined at ../../pkg/compiler/lib/src/dart2js.dart:1414:35 • (undefined_function)
Completed in 59.6s.
...

[biggs0125]

Updated the RBE build wrapper to include the relevant file from this package. With that I was able to build the SDK with remote execution.