Divide TraverseInitListExpr to a different function for each form.
Divide TraverseInitListExpr to a different function for each form.

Summary: create TraverseSyntacticInitListExpr and TraverseSemanticInitListExpr.

Reviewers: rsmith, klimek

Subscribers: klimek, cfe-commits, alexfh

Differential Revision: http://reviews.llvm.org/D13249

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@249129 91177308-0d34-0410-b5e6-96231b3b80d8

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