RFR: 8254360: Re-examine use of CodeBuffer::verify_section_allocation

[Nils Eliasson]

On Tue, 24 Nov 2020 23:36:22 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> - In release builds, only call `verify_section_allocation` in `~CodeBuffer`. This reduce overhead, while retaining most of the verification promises in product builds.
> - Minor touch-ups the implementation of `verify_section_allocation`: Use is_aligned. Add a `disjoint` predicate. Only compare two sections once per verification. Remove some redundant checks.

Looks good!

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Marked as reviewed by neliasso (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1421