…helper_call_expr (#21579)

## Summary

Follow-up to #21578. Since helper calls now always use `SPAN`, the `span` parameter is unnecessary. This removes it from `helper_call` and `helper_call_expr` and cleans up all 28 call sites across 12 files.

Also removes now-unused `span` parameters from internal functions that only existed to pass through to helper calls:
- `create_private_field_get`
- `create_private_field_set`
- `create_check_in_rhs`
- `create_private_instance_init_assignment_not_loose`

## Test plan

- `cargo build -p oxc_transformer` — no warnings (except pre-existing `oxc_allocator`)
- `cargo test -p oxc_transformer` — all pass
- `cargo run -p oxc_transform_conformance` — no snapshot changes

### 💥 BREAKING CHANGES

- 502e804 ast: [**BREAKING**] Reduce size of `TSTypePredicateName`
(#21711) (overlookmotel)
- 5651539 ast: [**BREAKING**] Reduce size of `JSXExpression` (#21710)
(overlookmotel)
- c44e280 ast: [**BREAKING**] Reduce size of `ArrayExpressionElement`
(#21709) (overlookmotel)
- c5b3deb syntax: [**BREAKING**] Remove `CommentNodeId` (#21679)
(overlookmotel)

### 🚀 Features

- b738a39 allocator: Add `Allocator::cursor_ptr` method (#21773)
(overlookmotel)
- 678767e ast: Generate node_id accessors for AST enum wrappers (#21653)
(camc314)
- f091d77 minifier: Inline constant spread elements into arrays (#21095)
(Armano)

### 🐛 Bug Fixes

- 0d608c2 minifier: Preserve raw CR in template literals (#21645)
(Dunqing)
- a889ea9 minifier: Track pure functions in DCE mode (#21722) (Dunqing)
- 674dfac allocator: `Arena` retry allocation when chunk size approaches
maximum (#21777) (overlookmotel)
- f130cc0 allocator: Fix arithmetic overflow in
`Arena::new_chunk_memory_details` (#21745) (overlookmotel)
- b9bf239 allocator: Fix UB in `Arena::grow_zeroed` (#21739)
(overlookmotel)
- d2b9389 allocator: Clippy warning when building without `testing`
feature (#21681) (camc314)
- 503dc86 codegen: Map sourcemaps from visible output starts (#21662)
(Dunqing)
- c92bd3b transformer: Use SPAN for synthesized helper calls to prevent
comment misattribution (#21578) (Dunqing)
- 0d80441 codegen: Add mapping before printing `#` for private ident
(#21619) (camc314)

### ⚡ Performance

- 9fa362e napi/parser: Do not generate tokens except in tests (#21811)
(overlookmotel)
- 0044392 allocator: Reduce branches when allocating new chunk (#21776)
(overlookmotel)
- 7896bd0 allocator: `Allocator::used_bytes` do not use chunk iterator
(#21771) (overlookmotel)
- a5c562f allocator: Remove check in `Arena::new_chunk_memory_details`
(#21750) (overlookmotel)
- 35bbe1f allocator: `Arena` use unchecked size round up where
guaranteed no overflow (#21743) (overlookmotel)
- ffe229b allocator: Remove unnecessary check from
`Arena::try_alloc_layout_slow_impl` (#21732) (overlookmotel)
- 72fece5 allocator: Use `NonNull::offset_from_unsigned` in
`Arena::chunk_capacity` (#21731) (overlookmotel)
- cab32ae ast: Add `#[inline(always)]` to `node_id` methods on enums
with all variants unboxed (#21707) (overlookmotel)
- b179688 parser: Allocate `TriviaBuilder` comments in the arena
(#21512) (Boshen)
- 2290f31 lexer: Fix perf of `Token::set_*` methods on Rust 1.95.0
(#21659) (overlookmotel)
- 1b58029 allocator: Move code into cold path in `Arena::alloc_layout`
(#21622) (overlookmotel)
- 3cf7cef allocator: Reduce instructions on allocation hot path (#21510)
(overlookmotel)

### 📚 Documentation

- ce65070 data_structures: Document why `as_ref` and `as_mut` on
`NonNullConst` and `NonNullMut` take `self` (#21800) (overlookmotel)
- 93b7dbd allocator: Improve doc comments for `ChunkFooter` (#21733)
(overlookmotel)
- 295db8d transformer: Fix comment (#21717) (overlookmotel)
- 5c93af8 ast: Add comments explaining `#[inline(always)]` to `node_id`
methods on enums (#21706) (overlookmotel)
- e4cea25 transform: Use the `node:` namespace in the example (#19998)
(루밀LuMir)

### 🛡️ Security

- d8076c9 deps: Update rolldown (#21639) (renovate)

Co-authored-by: Boshen <1430279+Boshen@users.noreply.github.com>