[Compiler V2] Turn on CFG simplification as default optimization

[fEst1ck]

Description

This PR enables the control flow graph simplification as a default optimization.

How Has This Been Tested?

Existing tests && comparison testing.

Type of Change

• [x] New feature
• [ ] Bug fix
• [ ] Breaking change
• [ ] Performance improvement
• [ ] Refactoring
• [ ] Dependency update
• [ ] Documentation update
• [ ] Tests

Which Components or Systems Does This Change Impact?

• [ ] Validator Node
• [ ] Full Node (API, Indexer, etc.)
• [x] Move/Aptos Virtual Machine
• [ ] Aptos Framework
• [ ] Aptos CLI/SDK
• [ ] Developer Infrastructure
• [ ] Move Compiler
• [ ] Other (specify)