[code-reflection] Integrated: bld script and bldr tools cleanup

[Gary Frost]

On Sun, 27 Oct 2024 16:39:34 GMT, Gary Frost <gfrost at openjdk.org> wrote:

> Some `bld` script maintenance and some `bldr/../Bldr.java` features to allow `jextract` and `java` execution from scripts
> 
> Added more checks to `hatrun.bash`
> 
> Added java launcher version of `hatrun.bash` called `hatrun` (chmod +x)

This pull request has now been integrated.

Changeset: 94b51497
Author:    Gary Frost <gfrost at openjdk.org>
URL:       https://git.openjdk.org/babylon/commit/94b5149779bed3715885955a9d9677f9e9d97d21
Stats:     911 lines in 6 files changed: 664 ins; 136 del; 111 mod

bld script and bldr tools cleanup

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PR: https://git.openjdk.org/babylon/pull/266