[zeek/spicy] ef818e: Add environment variable to omit CFG dataflow.

[Evan Typanski]

Branch: refs/heads/topic/etyp/omit-cfg-dataflow
Home: https://github.com/zeek/spicy
Commit: ef818e8bba1ac3757767c95cee438b1c0dbb466c
https://github.com/zeek/spicy/commit/ef818e8bba1ac3757767c95cee438b1c0dbb466c
Author: Evan Typanski <evan.t...@corelight.com>
Date: 2025-09-17 (Wed, 17 Sep 2025)

Changed paths:
M doc/toolchain.rst
M hilti/toolchain/include/compiler/detail/cfg.h
M hilti/toolchain/src/compiler/cfg.cc
A tests/Baseline/hilti.cfg.no-dataflow/output
A tests/hilti/cfg/no-dataflow.hlt

Log Message:
-----------
Add environment variable to omit CFG dataflow.

Closes #2158

It gets really annoying to have dataflow facts when they're not getting
used, so this adds an environment variable to disable them.


Commit: b0e2268a427d6f88ee68d257542821fc46eb8285
https://github.com/zeek/spicy/commit/b0e2268a427d6f88ee68d257542821fc46eb8285
Author: Evan Typanski <evan.t...@corelight.com>
Date: 2025-09-17 (Wed, 17 Sep 2025)

Changed paths:
M hilti/toolchain/src/compiler/optimizer.cc

Log Message:
-----------
Cleanup some optimizer code.

This includes a fix for a Coverity issue that shouldn't flag since
`succ_node` is directly from the graph.


Compare: https://github.com/zeek/spicy/compare/ef818e8bba1a%5E...b0e2268a427d

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