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Add RFC 9669 ALU64 END instruction support (bswap16/32/64) (#703)

* Add RFC 9669 ALU64 END (bswap16/32/64) instruction support

- Added EBPF_OP_BSWAP opcode definition (0xD7)
- Implemented interpreter support with __builtin_bswap fallbacks
- Added x86-64 JIT support using BSWAP instruction
- Added ARM64 JIT support using REV instructions
- Added instruction validation for BSWAP
- Updated assembler to support bswap16/32/64
- Updated disassembler to recognize bswap instructions
- Created test data files for bswap16, bswap32, bswap64

Co-authored-by: Alan-Jowett <20480683+Alan-Jowett@users.noreply.github.com>

* Fix disassembler class check for bswap vs le/be instructions

Co-authored-by: Alan-Jowett <20480683+Alan-Jowett@users.noreply.github.com>

* Improve comment clarity in disassembler for class naming

Co-authored-by: Alan-Jowett <20480683+Alan-Jowett@users.noreply.github.com>

* Add _codeql_* to .gitignore to exclude build artifacts

* Add _codeql_* to .gitignore to exclude build artifacts

Co-authored-by: Alan-Jowett <20480683+Alan-Jowett@users.noreply.github.com>

* Fix .gitignore formatting and remove accidentally committed build artifacts

- Add proper newline between .vscode/ and _codeql_* pattern
- Remove all _codeql_build_dir and _codeql_detected_source_root files that were accidentally committed

Co-authored-by: Alan-Jowett <20480683+Alan-Jowett@users.noreply.github.com>

* Add raw bytecode format to bswap tests for CI compatibility

The bpf_conformance_runner tool doesn't yet recognize bswap16/32/64 mnemonics.
Added raw bytecode format to test files so tests can run while bpf_conformance
is being updated with the new mnemonics.

Co-authored-by: Alan-Jowett <20480683+Alan-Jowett@users.noreply.github.com>

* Update bpf_conformance submodule to support bswap mnemonics

Updated external/bpf_conformance to commit 3d39948 which adds support for
bswap16/32/64 mnemonics. Removed raw bytecode sections from test files since
the conformance runner n... (continued)

3256 of 4172 relevant lines covered (78.04%)

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Source Files on job run-RelWithDebInfo-macos-latest-x86_64 - 21405500489.2