Bug 867348 - Part 1: Add an analysis that catches calls to certain functions involving arithmetic expressions; r=jrmuizel
Bug 867348 - Part 2: Apply MOZ_NO_ARITHMETIC_EXPR_IN_ARGUMENT to CheckedInt's constructor; r=jrmuizel,cpearce

Note that the analysis currently just looks at the AST subtree of the
function call site and is therefore unable to correctly deal with cases
such as the last two hunks of the change to OggCodecState.cpp.  Fixing
the analysis to deal with that would be very difficult, so we currently
adjust the code so that it compiles.  The first hunk in that file though
is a real bug that this analysis found.