PR21327 / C++ DR1652 / C++ DR73: comparing a past-the-end pointer for one
complete object to a pointer to the start of another complete object does
not evaluate to the constant 'false'. All other comparisons between the
addresses of subobjects of distinct complete objects still do.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@220343 91177308-0d34-0410-b5e6-96231b3b80d8