RFR: 8351645: C2: ExpandBitsNode::Ideal hits assert because of TOP input

[Jatin Bhateja]

Bugfix patch adds missing safe type access checks in Expand/Compress Ideal transforms.
Test mentioned in the bug report has been included allong with the patch.

Kindly review.

Best Regards,
Jatin

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Commit messages:
 - 8351645: C2: ExpandBitsNode::Ideal hits assert because of TOP input

Changes: https://git.openjdk.org/jdk/pull/25586/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25586&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351645
  Stats: 72 lines in 2 files changed: 70 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/25586.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25586/head:pull/25586

PR: https://git.openjdk.org/jdk/pull/25586