r174206 - Fix exception handling line table problems introduced by r173593

[Robinson, Paul]

> @@ -144,11 +144,13 @@ bool CodeGenFunction::EmitReturnBlock()
>      if (BI && BI->isUnconditional() &&
>          BI->getSuccessor(0) == ReturnBlock.getBlock()) {
>        // Reset insertion point, including debug location, and delete
> the branch.
> +      // this is really subtle & only works because the next change in
> location
> +      // will hit the caching in CGDebugInfo::EmitLocation & not
> override this

comments should be complete sentences with leading cap and trailing full-stop

:-)
--paulr