[analyzer] Remove possible pessimizations from r169563.

Thanks for reminding me about copy-elision, David. Passing references here
doesn't help when we could get move construction in C++11. If we really
cared, we'd use std::swap to steal the reference from the temporary arg,
but it's probably not /that/ critical outside of Profile anyway.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169570 91177308-0d34-0410-b5e6-96231b3b80d8

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