RFR: 8373495: C2: Aggressively fold loads from objects that have not escaped [v3]

[Quan Anh Mai]

> Hi,
> 
> This patch is an alternative to #28764 but it does the analysis during IGVN instead.
> 
> Please take a look and leave your thoughts, thanks a lot.

Quan Anh Mai has updated the pull request incrementally with one additional commit since the last revision:

  missing comment

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28812/files
  - new: https://git.openjdk.org/jdk/pull/28812/files/d8082201..0cfc9aee

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28812&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28812&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/28812.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28812/head:pull/28812

PR: https://git.openjdk.org/jdk/pull/28812