Under clang-3.8 we get:
compilerplugins/clang/passparamsbyref.cxx:158:31: error: no member named
'isAssignmentOp' in 'clang::CXXOperatorCallExpr'
Change-Id: Icfba2b624f53f07418674237adc5a47819f73c43
makes writing nice code awkward sometimes.
Also split plugin into two different plugins, the logic was getting
tangled up.
Change-Id: I232e314d29c766c160c29373988dc37a466505be