CodeGen: Let arrays be inputs to inline asm

An array showing up in an inline assembly input is accepted in ICC and
GCC 4.8

This fixes PR20201.

Differential Revision: http://reviews.llvm.org/D4382

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@212954 91177308-0d34-0410-b5e6-96231b3b80d8