[Exclusivity] Switch static checking to use IndexTrie instead of Proj…

[devincoughlin]

…ectionPath

IndexTrie is a more light-weight representation and it works well in this case.
This requires recovering the represented sequence from an IndexTrieNode, so
also add a getParent() method.

[devincoughlin]

\cc @atrick

[devincoughlin]

@swift-ci Please smoke test and merge

[devincoughlin]

@swift-ci please test

[swift-ci]

Build failed
Jenkins build - Swift Test OS X Platform
Git Commit - 06b9ed7
Test requested by - @devincoughlin

[devincoughlin]

@swift-ci please test and merge

[atrick]

👍

[najacque]

Huh. something is wonky with the PR test. Taking a look.

[najacque]

@swift-ci please test and merge

[najacque]

@swift-ci Please clean test

[najacque]

@swift-ci Please clean test

[swift-ci]

Build failed
Jenkins build - Swift Test OS X Platform
Git Commit - 06b9ed7
Test requested by - @najacque

[swift-ci]

Build failed
Jenkins build - Swift Test OS X Platform
Git Commit - 06b9ed7
Test requested by - @najacque

[najacque]

Master is busticated. There's a PR going in in a few mins that should fix it, then I'll kick this off again.

[najacque]

@swift-ci please test and merge
Ok, let's try this again, now that master is fixed.

[najacque]

@swift-ci please test

[shahmishal]

Comment has to be before the trigger :)
@swift-ci please test and merge

[najacque]

jinx!

[swift-ci]

Build failed
Jenkins build - Swift Test OS X Platform
Git Commit - 06b9ed7
Test requested by - @najacque

[najacque]

We had more breakage on master. Should be fixed now... Let's try this again.
@swift-ci please test

[swift-ci]

Build failed
Jenkins build - Swift Test OS X Platform
Git Commit - 06b9ed7
Test requested by - @najacque

[devincoughlin]

Let's "trie" this again.
@swift-ci Please smoke test and merge