RFR: Streamline write-barrier-prologue (C2 part)

[Aleksey Shipilev]

On 09/24/2018 03:26 PM, Roman Kennke wrote:
> http://cr.openjdk.java.net/~rkennke/streamline-wb-prologue/webrev.02/

Microbenchmarks and their generated code look fine. Spot-checked SPECjvm workloads seem also fine.

-Aleksey