EIP-7939: added CLZ opcode for Osaka

[Saw-mon-and-Natalie]

fixes:

• Add support for EIP-7939 CLZ (Osaka fork) #1262

[Saw-mon-and-Natalie]

@chfast wonder if you saw this PR ☺️

[chfast]

I wasn't aware of this PR. Thanks for the contribution.

[Copilot]

Pull Request Overview

This PR implements the EIP-7939 Count Leading Zeros (CLZ) opcode for the Osaka revision of the Ethereum Virtual Machine. The opcode counts the number of leading zero bits in a 256-bit value.

• Adds the OP_CLZ opcode (0x1e) with gas cost of 5 and activation from EVMC_OSAKA revision
• Implements comprehensive test coverage including pre-activation behavior, gas consumption, and various input/output scenarios
• Updates CI configuration to enable EIP-7939 test execution

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
lib/evmone/instructions_opcodes.hpp	Defines OP_CLZ constant (0x1e)
lib/evmone/instructions_xmacro.hpp	Maps OP_CLZ to clz instruction handler
lib/evmone/instructions_traits.hpp	Sets gas cost (5) and instruction traits for CLZ
lib/evmone/instructions.hpp	Implements clz instruction logic
test/utils/utils.cpp	Adds revision schedule for Prague to Osaka transition
test/utils/bytecode.hpp	Adds clz bytecode helper function
test/unittests/instructions_test.cpp	Marks CLZ as evmone-only instruction
test/unittests/evm_eip7939_clz_test.cpp	Comprehensive test suite for CLZ opcode
test/unittests/CMakeLists.txt	Includes CLZ test file in build
circle.yml	Removes CLZ from test exclusion filter

[chfast]

@Saw-mon-and-Natalie If you are interested in more contributions for Osaka, let me know.