RFR: 8342701: [PPC64] TestOSRLotsOfLocals.java crashes

[Martin Doerr]

Fix for "assert(nbits == 32 || (-(1 << (nbits-1)) <= x && x < (1 << (nbits-1)))) failed: value out of range" in new test "TestOSRLotsOfLocals" (see JBS).

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Commit messages:
 - 8342701: [PPC64] TestOSRLotsOfLocals.java crashes

Changes: https://git.openjdk.org/jdk/pull/21613/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21613&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342701
  Stats: 19 lines in 1 file changed: 16 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/21613.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21613/head:pull/21613

PR: https://git.openjdk.org/jdk/pull/21613