RFR: 8253525: Implement getInstanceSize/sizeOf intrinsics [v3]

[Aleksey Shipilev]

On Tue, 20 Oct 2020 17:33:56 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Aleksey Shipilev has refreshed the contents of this pull request, and previous commits have been removed. The
>> incremental views will show differences compared to the previous content of the PR.
>
> test/jdk/java/lang/instrument/GetObjectSizeTest.java line 2:
> 
>> 1: /*
>> 2:  * Copyright (c) 2020, Red Hat, Inc. All rights reserved.
> 
> You can't replace Copyright lines of one company with other.

Well, I am replacing the entire file. There is a recent precedent of the similar change
[here](https://github.com/openjdk/jdk/commit/6d13c766#diff-0daf75421f8fdb55a5640742ef6f12730fe1b370cc864311c188ad99996b51fe).
Either that should be reversed, or this one accepted.

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PR: https://git.openjdk.java.net/jdk/pull/650