This test does not pass for -target i686-pc-windows-gnu (-mingw32)
when clang is built with mingw-w64 4.9.1 or according to 
http://llvm.org/PR20995  , mingw-w64 4.7.2 as well.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@224453 91177308-0d34-0410-b5e6-96231b3b80d8
Destroy the diagnostic client first in ~DiagnosticEngine

Add a comment and a test to ~DiagnosticEngine about the ordering
requirements on the teardown of DiagnosticConsumer. This could also be
accomplished by rearranging the fields of ~DiagnosticEngine, but I felt
that this was a better, more explicit solution.

This fixes PR21911, an issue that occurred after the unique_ptr
migration in r222193.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@224454 91177308-0d34-0410-b5e6-96231b3b80d8
[c++1z] Fixes for generalized non-type template argument support: check for
exact type match for deduced template arguments, and be sure to produce correct
canonical TemplateArgument representations to enable correct redeclaration
matching.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@224456 91177308-0d34-0410-b5e6-96231b3b80d8