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Use ProcessManager for Xcode tool invocations (#10955)

1. Run all Xcode tool invocations through ProcessManager, which allows
us to mock out failures, etc. for tests.

2. Add said tests.
C
Chris Bracken committed
2ebb9e5dc6c46bf7177af6249a3a0fee056d1322
Parent: bbea0c3
Committed by GitHub <noreply@github.com> on 6/24/2017, 1:50:27 AM