Change 'Emit' to 'EmitCaret' which sums up what it *should* be doing.
Also note that it is actually doing much more than it should. This paves
the way for building a more generic 'Emit' routine that is the real
entry point here.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142035 91177308-0d34-0410-b5e6-96231b3b80d8
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