RFR: 8254661: arm32: additional cleanup after fixing SIGSEGV

[Boris Ulasevich]

This change fixes the fastdebug build assertion. This is actually a missing change for [8253901: ARM32: SIGSEGV during monitorexit](https://github.com/openjdk/jdk/pull/503)

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Commit messages:
 - 8254661: arm32: additional cleanup after fixing SIGSEGV

Changes: https://git.openjdk.java.net/jdk/pull/1157/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1157&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254661
  Stats: 3 lines in 1 file changed: 0 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1157.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1157/head:pull/1157

PR: https://git.openjdk.java.net/jdk/pull/1157