[mangling][slice]SliceMut int *和int *owned去实例化的时候实例化的函数同名导致非预期编译报错

【问题代码】
```
void test_pointer() {
    int *ptr = malloc(sizeof(int));
    SliceMut<int*> slice = SliceMut<int*>::new(&mut ptr, 1);
    Slice<int*> sub = slice.sub(0, 1);
    assert(sub.len == 1);
}

void test_owned() {
    int *owned ptr = safe_malloc<int>(2);
    SliceMut<int *owned> slice = SliceMut<int *owned>::new(&mut ptr, 2);
    Slice<int *owned> sub = slice.sub(0, 2);
    assert(sub.len == 2);
    safe_free((void *owned) ptr);
}

int main() {
    test_pointer();
    test_owned();
}
```

【报错信息】
/home/luyijing/workspace/toolchain/clang+llvm/include/libcbs/slice.hbs:122:33: error: definition with same mangled name 'struct_SliceMut_int_P_new' as another definition
unsafe SliceMut<T> SliceMut<T>::new(T *borrow _Nonnull ptr, size_t len) {
                                ^
/home/luyijing/workspace/toolchain/clang+llvm/include/libcbs/slice.hbs:122:33: note: previous definition is here
/home/luyijing/workspace/toolchain/clang+llvm/include/libcbs/slice.hbs:132:28: error: definition with same mangled name 'struct_SliceMut_int_P_sub' as another definition
safe Slice<T> SliceMut<T>::sub(This this, size_t start, size_t end) {
                           ^
/home/luyijing/workspace/toolchain/clang+llvm/include/libcbs/slice.hbs:132:28: note: previous definition is here
2 errors generated

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[mangling][slice]SliceMut int 和int owned去实例化的时候实例化的函数同名导致非预期编译报错

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[mangling][slice]SliceMut int 和int owned去实例化的时候实例化的函数同名导致非预期编译报错