Begin the refactoring of how builtin operators are added to the overload

candidate set. This breaks apart a huge switch + goto system into distinct
methods on a class. It also places the current mess of tables and other static
state used in the process within that class.

This is still a work in progress. I did a few simplifications that jumped out
at me as I went, but I plan to iterate on this a bit before it's truly clean.
However, this is easily the most invasive chunk. I benchmarked it on
all-std-headers.cpp and an internal testcase that has a major hotspot in
overload resolution and saw no real performance impact.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@121623 91177308-0d34-0410-b5e6-96231b3b80d8

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