Function patch_seq_peek_int_value 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn patch_seq_peek_int_value(stack: Stack) -> i64

Helper for peeking at the top integer value without popping

Returns the integer value on top of the stack without modifying the stack. Used in conjunction with pop_stack for conditional branching.

Why separate peek and pop? In LLVM IR for conditionals, we need to:

1. Extract the integer value to test it (peek_int_value)
2. Branch based on that value (icmp + br)
3. Free the stack node in both branches (pop_stack)

A combined pop_int_value would leak memory since we’d need the value before branching but couldn’t return the updated stack pointer through both branches. Separating these operations prevents memory leaks.

Stack effect: ( n – n ) returns n

Safety

Stack must have an Int value on top