Remove incorrect noop in unix stack pool management (#13069)

This commit removes a call to `commit_pages` in the `unix_stack_pool.rs`
file. This function is a noop on unix and the parameters passed in for
this call were also incorrect if it actually needed to do something
anyway. This is otherwise just distracting, so remove it.

Author: alexcrichton

crates/wasmtime/src/runtime/vm/instance/allocator/pooling/unix_stack_pool.rs

@@ -2,7 +2,6 @@
 
 use super::index_allocator::{SimpleIndexAllocator, SlotId};
 use crate::prelude::*;
-use crate::runtime::vm::sys::vm::commit_pages;
 use crate::runtime::vm::{
     HostAlignedByteCount, Mmap, PoolingInstanceAllocatorConfig, mmap::AlignedLength,
 };
@@ -121,8 +120,6 @@ impl StackPool {
                 .add(self.stack_size.unchecked_mul(index).byte_count())
                 .cast_mut();
 
-            commit_pages(bottom_of_stack, size_without_guard.byte_count())?;
-
             let stack = wasmtime_fiber::FiberStack::from_raw_parts(
                 bottom_of_stack,
                 self.page_size.byte_count(),