Fix for bug http://llvm.org/PR17427.
Assertion failed: "Computed __func__ length differs from type!"
Reworked PredefinedExpr representation with internal StringLiteral field for function declaration.
Differential Revision: http://reviews.llvm.org/D5365
Update test to reflect the true section contents

Previously, LLVM object tools didn't know the true size of the sections.
This would result in tools thinking that a section with a VirtualSize
smaller than FileAlignment would end in zeros when actually those zeros
weren't really part of the section contents.