[exir] Allow additional flatc options to preserve Vulkan signed zero - #23203
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flatc omits scalar fields equal to their schema default. Because -0.0 == 0.0, a negative-zero Double is dropped and deserializes as +0.0. _flatc_compile gains flatc_additional_args, matching the decompiler API, to pass --force-defaults, and the Vulkan serializer opts in so signed zeros survive the round trip. Other flatbuffer users are unchanged. Authored with OpenAI Codex; split planned with Claude Code.
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/23203
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Superseded by #23242, part 3/15 of the ghstack replacement series. The current integration PR is #23254. This PR is closed in favor of the replacement; its previous description and review history are retained.
flatc omits scalar fields equal to their schema default. Because -0.0 == 0.0, a negative-zero Double is dropped and deserializes as +0.0. _flatc_compile gains flatc_additional_args, matching the decompiler API, to pass --force-defaults, and the Vulkan serializer opts in so signed zeros survive the round trip. Other flatbuffer users are unchanged.
Part 3/15 of the Vulkan transformer and operator-conformance stack. Depends on #23202; review against the selected base branch. Integration PR: #23162.
Validation: 24 passed, 2 warnings in 4.37s. Lintrunner and git diff --check pass.
Authored with OpenAI Codex; split planned with Claude Code.
cc @SS-JIA @manuelcandales @digantdesai @cbilgin