git: openjdk/babylon: code-reflection: Add BlockGroup experiment

[Gary Frost]

Changeset: f6d2f1d6
Branch: code-reflection
Author:    Gary Frost <gfrost at openjdk.org>
Date:      2026-01-09 13:13:55 +0000
URL:       https://git.openjdk.org/babylon/commit/f6d2f1d66caf557dda1dda463d75cc592bb5e7f8

Add BlockGroup experiment

+ hat/examples/experiments/src/main/java/experiments/BlockGroup.java
! hat/optkl/src/main/java/optkl/codebuilders/BabylonOpDispatcher.java
! hat/optkl/src/main/java/optkl/codebuilders/JavaCodeBuilder.java
! hat/optkl/src/main/java/optkl/codebuilders/JavaOrC99StyleCodeBuilder.java