RFR: 8286660: codestrings gtest fails on AArch64: "udf" in padding

[Aleksey Shipilev]

On hsdis-enabled AArch64 machine this test fails even with [JDK-8274039](https://bugs.openjdk.java.net/browse/JDK-8274039):


$ CONF=linux-aarch64-server-fastdebug make run-test TEST=jtreg:gtest/GTestWrapper.java

[----------] 1 test from codestrings
[ RUN      ] codestrings.validate_vm

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Commit messages:
 - Fix

Changes: https://git.openjdk.java.net/jdk/pull/8695/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8695&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8286660
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8695.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8695/head:pull/8695

PR: https://git.openjdk.java.net/jdk/pull/8695