[lworld] RFR: 8269578: [lworld] fix AArch64 build after JDK-8267824

[Nick Gasson]

Replace ConstantPoolCacheEntry::is_inline_type_shift with
is_null_free_inline_type_shift and change inline_type to
null_free_inline_type in a few other places to match x86.

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

Commit messages:
 - 8269578: [lworld] fix AArch64 build after JDK-8267824

Changes: https://git.openjdk.java.net/valhalla/pull/467/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=467&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269578
  Stats: 14 lines in 3 files changed: 0 ins; 0 del; 14 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/467.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/467/head:pull/467

PR: https://git.openjdk.java.net/valhalla/pull/467