feat: Enhance power operation gas estimation

[tal7aouy]

Description

Improves gas estimation accuracy for power operations by implementing precise byte length calculations and optimizing gas costs.

Changes

def estimate_pow_gas(x, y, typ):
    """
    Estimate gas cost for power operation with optimized byte length calculation.
    
    Args:
        x: Base value IRnode
        y: Exponent value IRnode
        typ: Type information
    
    Returns:
        int: Estimated gas cost (base_cost + byte_length * 50)
    """
    base_gas = 10

    # Optimize gas calculation based on literal/non-literal values
    if y.is_literal:
        # For literal values, use exact bit length
        byte_length = max(1, (y.value.bit_length() + 7) // 8)
    else:
        # For non-literal values, use minimum required bytes based on type
        byte_length = max(1, (typ.bits + 7) // 8)

    return base_gas + (50 * byte_length)

Impact

• More accurate gas estimation for power operations
• Better optimization for literal values
• No breaking changes to existing functionality