RFR: 8291003: ARM32: constant_table.size assertion

[Boris Ulasevich]

This change fixes assertion condition as per the recent [JDK-8287373](https://bugs.openjdk.org/browse/JDK-8287373) change: the size of constants section is aligned up according to the settings of the next section (instructions section).

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Commit messages:
 - 8291003: ARM32: constant_table.size assertion

Changes: https://git.openjdk.org/jdk/pull/9672/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9672&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8291003
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9672.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9672/head:pull/9672

PR: https://git.openjdk.org/jdk/pull/9672