[BUG] optimization causes segfault in parallelized code

[Drunte]

Bug description

Code included below.

When implementing SAXPY(a "hello world" example for parallel algorithms) an unexpected segfault happens in the parallelized closure when compiling with default settings(with optimizations ON). Turning optimizations OFF using -O0 fixes the segfault and gives the correct result. The sequential implementation does not segfault.

Steps to reproduce

• Include relevant code snippet or link to code that did not work as expected.

    from algorithm import parallelize
  
    fn main():  
        var num_items: Int = 99999999; 
  
        var a: Int32 = 2;
  
        var X = List[Int32](capacity = num_items);
        var Y = List[Int32](capacity = num_items);
  
        X.resize(num_items, 3);
        Y.resize(num_items, 4);
  
        @parameter
        fn inner_saxpy(i: Int) -> None:
            Y[i] += a * X[i]; #segfault
    
        parallelize[inner_saxpy](num_items);
  
        var s: Int32 = 0;
        for i in range(num_items): #can also be done in parallel(leaving that out for demonstration purposes).
            s += Y[i];
  
        print(s); #prints 999999990
  

• Include anything else that might help us debug the issue.

Using max Tensor instead of List has the same behavior. Using unsafe pointer doesn't segfault but gives wrong result(correct result with -O0).
Declaring X and Y with List[Int32, True] has same behavior. Specifying number of workers in parallelize has same behavior.
The sequential implementation(not shown here) uses a normal for-loop and works as intended with optimizations ON.

When ran in the mojo playground the output is empty, but should be 999999990.

System information

- What OS did you do install Mojo on ? --- ubuntu 22.04.5 LTS
- Provide version information for Mojo by pasting the output of `mojo -v` --- 24.5.0 (e8aacb95)
- Provide Magic CLI version by pasting the output of `magic -V` or `magic --version` --- 0.4.0 (based on pixi 0.33.0)

Hardware:
    Intel 13700k (8P/8E/24T) CPU
    nvidia 4070 GPU
    kingston 7200MTs CL38 32GB RAM
    gigabyte Z790 motherboard

[Drunte]

i struggled to fix the indentations in the code snippet.