[testsuite] Update several scev/IVOPTs cases

[Jeff Law]

On Tue, 2020-02-25 at 17:52 +0800, Kewen.Lin wrote:
> Hi, 
> 
> Several scev/IVOPTs cases aim to check some array references are sceved and
> later marked as REFERENCE ADDRESS IV groups. With IV group type dumping
> improving, these check strings can be improved. Otherwise, they become
> fragile
> with dumping changes.
> 
> This patch is to keep check strings concise, meanwhile recover the coverage
> of
> case scev-8.c.
> 
> Bootstrapped/regtested on powerpc64le-linux-gnu (LE). 
> 
> Is it ok for trunk?
> 
> BR,
> Kewen
> -----------
> 
> gcc/testsuite/ChangeLog
> 
> 2020-02-25  Kewen Lin  <linkw@gcc.gnu.org>
> 
> 	* gcc.dg/tree-ssa/scev-8.c: Revise check string.
> 	* gcc.dg/tree-ssa/scev-9.c: Ditto.
> 	* gcc.dg/tree-ssa/scev-10.c: Ditto.
> 	* gcc.dg/tree-ssa/scev-11.c: Ditto.
> 	* gcc.dg/tree-ssa/scev-12.c: Ditto.
OK
jeff