RFR: 8310524: C2: record parser-generated LoadN nodes for IGVN [v3]

[Daniel Lundén]

> This changeset fixes an issue where LoadN nodes were not recorded during bytecode parsing for later revisit in IGVN, in some cases resulting in missed optimization opportunities (see, e.g., the included new regression test).
> 
> Changes:
> - Make sure to record newly added LoadN-nodes for IGVN in `GraphKit::make_load`.
> - Add a regression test.
> 
> ### Testing
> - tier1, tier2, tier3, tier4, tier5 (windows-x64, linux-x64, linux-aarch64, macosx-x64, macosx-aarch64)

Daniel Lundén has updated the pull request incrementally with one additional commit since the last revision:

  Switch to @DontInline

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/16967/files
  - new: https://git.openjdk.org/jdk/pull/16967/files/23f80e63..78a86af2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16967&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16967&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16967.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16967/head:pull/16967

PR: https://git.openjdk.org/jdk/pull/16967