Update equality and relationship comparisons of pointers to reflect
C++ semantics, eliminating an extension diagnostic that doesn't match
C++ semantics (ordered comparison with NULL) and tightening some
extwarns to errors in C++ to match GCC and maintain conformance in
SFINAE contexts. Fixes <rdar://problem/7941392>.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@106050 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed