[PATCH] D14938: Fix implicit conversion from _Nullable to _Nonnull warnings in C++

[George Burgess IV via cfe-commits]

george.burgess.iv created this revision.
george.burgess.iv added a reviewer: doug.gregor.
george.burgess.iv added subscribers: cfe-commits, doug.gregor.

Currently, code like this compiles cleanly in C++, but with warnings (as it should) in C:

```
int foo() {
  void *_Nullable p;
  void *_Nonnull n = p;
}
```

This patch makes us emit the appropriate warnings in C++.

@doug.gregor: `arc` said you would be best to review this; if you're unable to, I'm happy to ping others. :)

http://reviews.llvm.org/D14938

Files:
  include/clang/Sema/Sema.h
  lib/Sema/Sema.cpp
  lib/Sema/SemaExpr.cpp
  lib/Sema/SemaExprCXX.cpp
  test/SemaCXX/nullability.cpp

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