[PATCH] Add non-blocking Wait() for launched processes

[Tareq A. Siraj]

tareqsiraj added you to the CC list for the revision "Add non-blocking Wait() for launched processes".

Hi revane, chandlerc, Bigcheese,

- New ProcessInfo class to encapsulate information about child
  processes.
- Generalized the Wait() to support non-blocking wait on child
  processes.
- ExecuteNoWait() now return 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.

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

Files:
  include/llvm/Support/Program.h
  lib/Support/Program.cpp
  lib/Support/Unix/Program.inc
  lib/Support/Windows/Program.inc
  unittests/Support/ProgramTest.cpp
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