Reverting changes from r173785 (removing empty lines before "}").

This needs some more thinking, e.g. for namespaces, chains of if-else
if, ...

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173787 91177308-0d34-0410-b5e6-96231b3b80d8
Downgrade 'attribute ignored when parsing type' from error to warning, to match
the diagnostic's warn_ name. Switch some places (notably C++11 attributes)
which really wanted an error over to a different diagnostic. Finally, suppress
the diagnostic entirely for __ptr32, __ptr64 and __w64, to avoid producing
diagnostics in important system headers.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173788 91177308-0d34-0410-b5e6-96231b3b80d8
Produce a diagnostic if alignas is applied to an expression. Neither C11 nor
C++11 allows that.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173789 91177308-0d34-0410-b5e6-96231b3b80d8
Test update missed in r173789.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173790 91177308-0d34-0410-b5e6-96231b3b80d8
Add a diagnostic for an OpenCL kernel with a pointer pointer argument.
Also refactor the surrounding code a little.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173791 91177308-0d34-0410-b5e6-96231b3b80d8