RFR: SFX AddP cloning should check for dependent AddP explicitly

[Aleksey Shipilev]

On 7/15/19 1:30 PM, Aleksey Shipilev wrote:
> CTW tests fail with sh/jdk with the assert here:
>  1545         assert(addr2->Opcode() == Op_AddP, "expected");
> 
> I believe we should instead check for the shape of the graph explicitly here:
>   http://cr.openjdk.java.net/~shade/shenandoah/sfx-hard-arr/webrev.01/

This also apparently fixes a lot of x86_32 CTW tests.

-- 
Thanks,
-Aleksey