RFR: 8291003: ARM32: constant_table.size assertion [v2]

[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).

Boris Ulasevich has updated the pull request incrementally with one additional commit since the last revision:

  align_at_start api clarification, use explicit section index in the expression

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9672/files
  - new: https://git.openjdk.org/jdk/pull/9672/files/eaa5cfb8..810a9433

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9672&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9672&range=00-01

  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 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