[PATCH] Add warnings so that Clang can catch most of the cases that GCC's -Waddress can catch

[Richard Trieu]

================
Comment at: lib/Sema/SemaChecking.cpp:5698
@@ +5697,3 @@
+/// \param Range Extra SourceRange to highlight in the diagnostic
+void Sema::DiagnosePointer(Expr *E, Expr::NullPointerConstantKind NullKind,
+                           bool IsEqual, SourceRange Range) {
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David Majnemer wrote:
> `DiagnosePointer` is rather vague, perhaps something like `diagnoseTautologicalPointerCompare` ?
Tautological compare is only half of the warnings generated.  There are also pointer to bool conversion warnings here too.


http://llvm-reviews.chandlerc.com/D2645