RFR: 8332245: C2: missing record_for_ign() call in GraphKit::must_be_not_null() [v3]

[Roland Westrelin]

> The `If` node that's created by `GraphKit::must_be_not_null()` is not
> enqueued for igvn when it's created. The test case shows it prevents 2
> identical tests from commoning when the first igvn executes. This is a
> minor issue I noticed whule working on something else.

Roland Westrelin has updated the pull request incrementally with one additional commit since the last revision:

  Update src/hotspot/share/opto/graphKit.cpp
  
  Co-authored-by: Tobias Hartmann <tobias.hartmann at oracle.com>

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/19233/files
  - new: https://git.openjdk.org/jdk/pull/19233/files/48fb906c..afc87210

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19233&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19233&range=01-02

  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/19233.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19233/head:pull/19233

PR: https://git.openjdk.org/jdk/pull/19233