Integrated: 8258625: [JVMCI] refactor and unify JVMCI readFieldValue path

[Tom Rodriguez]

On Fri, 23 Apr 2021 18:39:11 GMT, Tom Rodriguez <never at openjdk.org> wrote:

> This was originally just a cleanup but it turned out to be a partial safety fix for folding reads during compilation.  I've rolled in a couple other safety checks that were found along the way, along with jtreg test improvements that exercise the new paths.

This pull request has now been integrated.

Changeset: 852a41d7
Author:    Tom Rodriguez <never at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/852a41d7
Stats:     799 lines in 17 files changed: 170 ins; 529 del; 100 mod

8258625: [JVMCI] refactor and unify JVMCI readFieldValue path

Reviewed-by: kvn

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PR: https://git.openjdk.java.net/jdk/pull/3659