[lworld] RFR: 8280440: [lworld] Scalarization does not properly handle speculative types

[Tobias Hartmann]

This patch fixes several issues with handling speculative types in combination with scalarization in C2 (wrong results and asserts). I added tests that cover all cases.

Thanks,
Tobias

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Commit messages:
 - 8280440: [lworld] Scalarization does not properly handle speculative types

Changes: https://git.openjdk.java.net/valhalla/pull/610/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=610&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280440
  Stats: 187 lines in 8 files changed: 160 ins; 12 del; 15 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/610.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/610/head:pull/610

PR: https://git.openjdk.java.net/valhalla/pull/610