Diagnostics improvements for 3.9

[Richard Smith via cfe-commits]

These all look OK for the branch. Hans, the second one fixes a crasher, so
I'd like to take at least that one. The others fix warning false positives
(which are not regressions) and look fairly safe.

On Fri, Aug 5, 2016 at 4:39 PM, Richard Trieu <rtrieu at google.com> wrote:

> Hans, Richard,
>
> These are some last minute diagnostic improvements for 3.9.
>
> http://llvm.org/viewvc/llvm-project?rev=277796&view=rev
> r277796
> Don't warn when negative values, like -1, are used to initialize unsigned
> bit fields.
>
> http://llvm.org/viewvc/llvm-project?rev=277797&view=rev
> r277797
> Fix crash with type alias in Template Type Diffing
>

(You have a typo Internalal in this.)


> http://llvm.org/viewvc/llvm-project?rev=277866&view=rev
> r277866
> Fix false positive in -Wunsequenced and templates
>
> http://llvm.org/viewvc/llvm-project?rev=277889&view=rev
> r277889
> Fixes for two false positives in -Wreturn-stack-address dealing with
> parameter variables and reference to pointer types.
>

(Test has some x3 variables that are unused.)
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