Return true from UnifySection when emitting a diagnostic
Return true from UnifySection when emitting a diagnostic

Test Plan: I noticed this through code inspection.  The callers use the return value to remove the SectionAttr if a diagnostic is emitted, but I don't think the failure to do so is observable right now.

Reviewers: rnk

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D5438

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@218265 91177308-0d34-0410-b5e6-96231b3b80d8

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