RFR: 8341831: PhaseCFG::insert_anti_dependences asserts with "no loads" [v2]

[Igor Veresov]

> `CacheWB` nodes are peculiar in a sense that they both are anti-dependent and produce memory. I think it's reasonable to relax the assert in `insert_anti_dependences()` to work around their properties.

Igor Veresov has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Remove the test from the problem list
 - 8341831: PhaseCFG::insert_anti_dependences asserts with "no loads"
   Summary: Relax assert to deal with CacheWB nodes

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Changes: https://git.openjdk.org/jdk/pull/21455/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21455&range=01
  Stats: 11 lines in 2 files changed: 8 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/21455.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21455/head:pull/21455

PR: https://git.openjdk.org/jdk/pull/21455