Diagnostics improvements for 3.9

[Richard Trieu via cfe-commits]

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

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.

Richard
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