refactor: remove __rust_probestack workaround (#11326)

Remove custom __rust_probestack implementation that was added as a workaround
for wasmer linking issues. This cleanup removes:
- compiler_builtins_probestack.rs module with custom stack probing code
- Related feature flags (abi_custom) and force linking code
- Probestack module exports from the compiler module

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude <[email protected]>

Author: h-a-n-a

crates/rspack_javascript_compiler/src/compiler/compiler_builtins_probestack.rs

@@ -1,12 +1,5 @@
 use std::sync::Arc;
 
-// Wasmer depends on the __rust_probestack symbol
-// This symbol is now mangled and no longer exposed (on nightly). Therefore, building wasmer fails during linking.
-// Added this symbol back as a workaround.
-// See: https://github.com/wasmerio/wasmer/issues/5610
-#[doc(hidden)]
-pub mod compiler_builtins_probestack;
-
 pub mod minify;
 pub mod parse;
 pub mod stringify;

crates/rspack_javascript_compiler/src/compiler/mod.rs

@@ -1,21 +1,5 @@
-// See crates/rspack_javascript_compiler/src/compiler/compiler_builtins_probestack.rs
-// for the reason why this feature is needed.
-#![feature(abi_custom)]
-#![allow(internal_features)]
-
 pub mod ast;
 mod compiler;
 mod error;
 
 pub use compiler::{JavaScriptCompiler, TransformOutput, minify, parse, transform};
-
-// Force linking of probestack symbols when conditions are met
-// This ensures the __rust_probestack symbol is always included in the binary
-// See crates/rspack_javascript_compiler/src/compiler/compiler_builtins_probestack.rs
-#[cfg(all(
-  not(any(windows, target_os = "cygwin")),
-  any(target_arch = "x86_64", target_arch = "x86")
-))]
-#[used]
-static _FORCE_LINK_PROBESTACK: unsafe extern "custom" fn() =
-  compiler::compiler_builtins_probestack::__rust_probestack;