[lworld] RFR: 8269231: Fix 32-bit Valhalla (Zero) builds

[Aleksey Shipilev]

Building linux-x86-zero-fastdebug builds shows a few 32-bit cleanliness problems.

The first failure is:

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Commit messages:
 - 8269231: Fix 32-bit Valhalla (Zero) builds

Changes: https://git.openjdk.java.net/valhalla/pull/460/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=460&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269231
  Stats: 34 lines in 8 files changed: 26 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/460.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/460/head:pull/460

PR: https://git.openjdk.java.net/valhalla/pull/460