RFR: Cherry-pick: 8213473: Replace testB_mem_imm matcher with testUB_mem_imm plus Shenandoah parts

[Aleksey Shipilev]

On 11/12/2018 11:01 PM, Roman Kennke wrote:
> This seems an obvious fix in hindsight, but somehow we did not
> originally make it ;-)
> 
> In order to reduce mess when merging from upstream, I'd like to
> cherry-pick "8213473: Replace testB_mem_imm matcher with testUB_mem_imm"
> and remove the Shenandoah parts from mulnode.cpp
> 
> Testing: tier3_gc_shenandoah

OK, it should go as separate changeset not because it reduces merge load, but because it needs to be
backported.

-Aleksey