RFR: 8230486: G1BarrierSetAssembler::g1_write_barrier_post unnecessarily pushes/pops new_val in x86 code

[Kim Barrett]

On Mon, 17 May 2021 13:25:25 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Removes the unnecessary push/pop instruction.
> 
> Test: hotspot_gc

aarch64 looks like it has the same problem.  I think other platforms don't.

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PR: https://git.openjdk.java.net/jdk/pull/4063