Revert "Pretty Printer: Fix printing of conversion operator decls and calls."

This reverts commit r202167.

It broke Analysis/auto-obj-dtors-cfg-output.cpp

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@202173 91177308-0d34-0410-b5e6-96231b3b80d8