- Introduces F32 and F64 types and Float operand variant to the IR.
- Implements floating-point binary operations (FAdd, FSub, FMul, FDiv, FRem, FCmp) and FNeg unary op.
- Updates IR printer, validator, and builder to handle the new floating-point functionality.
- Extends the constant folding pass to evaluate floating-point expressions at compile time.
- Enhances x86_64 backend with XMM register support and floating-point codegen.
- Implements a fixed-point iteration pass for register type resolution to correctly allocate GPR vs XMM registers.
- Updates the linear scan allocator to manage multiple register classes (GPR, XMM).
- Adds System V ABI compliant handling for floating-point function arguments and return values.
- Includes comprehensive tests for IR validation, constant folding, and assembly generation.
