[HW] Make hw::getBitWidth use std::optional vs -1#9288

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Copilot wants to merge 17 commits intomainfrom

copilot/make-getbitwidth-use-optional

Commits on Dec 2, 2025

Initial plan
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Update getBitWidth to return std::optional<uint64_t> - core changes

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Update callsites in ESI, Arc, Verif, LLHD, Synth dialects

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Update callsites in Synth and LLHD dialects

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Update callsites in Conversion passes

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Update callsites in Seq, HW transforms, Synth analysis

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Update callsites in FIRRTL, Target/DebugInfo, MooreToCore

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Complete MooreToCore callsite updates

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Complete ExportVerilog and HWModuleGraph updates - all callsites updated

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Fix uint64_t to int64_t narrowing conversion issues in getBitWidth implementations

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Fix formatting and change BitWidthTypeInterface to return std::optional<uint64_t>

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Apply clang-format fixes as reported by CI

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Fix remaining clang-format issue in SeqOps.cpp

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Combine string literals in SeqOps.cpp to fix clang-format

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Fix clang-format issue in LongestPathAnalysis.cpp

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Add missing <optional> include to HWTypes.h

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Return -1 instead of asserting for int64_t getBitWidth conversions

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