Tareq A. Siraj c269c4f505 Add non-blocking Wait() for launched processes ...

- New ProcessInfo class to encapsulate information about child processes.
- Generalized the Wait() to support non-blocking wait on child processes.
- ExecuteNoWait() now returns a ProcessInfo object with information about
  the launched child. Users will be able to use this object to
  perform non-blocking wait.
- ExecuteNoWait() now accepts an ExecutionFailed param that tells if execution
  failed or not.

These changes will allow users to implement basic process parallel
tools.

Differential Revision: http://llvm-reviews.chandlerc.com/D1728


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191763 91177308-0d34-0410-b5e6-96231b3b80d8

2013-10-01 14:28:18 +00:00

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