RFR: 8253146: C2: Purge unused MachCallNode::_arg_size field

Tue Sep 15 07:21:29 UTC 2020

On Tue, 15 Sep 2020 07:14:58 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> While doing changes in related code, noticed that `MachCallNode::_arg_size` is computed needlessly, taking memory
> without a good reason. Let's purge it.
> Testing: text search for _argsize; Linux x86_64 {release,fastdebug,slowdebug} builds; Linux x86_64 tier1; Linux ppc64
> fastdebug build

This touches `ppc.ad`, attention @GoeLin, @TheRealMDoerr.

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PR: https://git.openjdk.java.net/jdk/pull/167